How do I fix a slow computer?

First, do a proper Restart (not Shut Down, they're different on Windows). Open Task Manager and sort by CPU to find what's hogging resources. Common culprits are WMI Provider Host, antivirus scans, and browsers with many tabs. Check that your C: drive has at least 10 GB free. Disable high-impact startup apps in Task Manager → Startup Apps. Run 'sfc /scannow' in Command Prompt as administrator to repair corrupted system files. Also check your Power Plan: laptops on Power Saver mode deliberately run slow.

How do I fix slow or no internet?

Unplug your router from the wall for a full 30 seconds, then plug it back in and wait 2 minutes. Try switching from 2.4GHz Wi-Fi to the 5GHz band (or vice versa if you're far from the router). Change your DNS to 1.1.1.1 (Cloudflare) for faster lookups. Run 'netsh winsock reset' and 'ipconfig /flushdns' in Command Prompt as administrator. Check if Windows Update or OneDrive is using your bandwidth in Task Manager → Resource Monitor → Network.

How do I fix no sound on my computer?

Right-click the speaker icon and check the Output device is set to your actual speakers, not HDMI or a phantom device. Open Sound settings → Playback → double-click your device → Enhancements tab → tick 'Disable all enhancements'. Check the Advanced tab and untick 'Allow applications to take exclusive control'. Apps like Discord can mute all other audio. Open Volume Mixer and check the per-app slider for your specific program. Also check the Communications tab and set it to 'Do nothing'.

How do I fix a frozen or unresponsive screen?

Wait at least 60 seconds first. Windows may just be working hard. Try Ctrl + Alt + Delete → Task Manager → End Task on the frozen app. Press Windows + Ctrl + Shift + B to reset the graphics driver without restarting (fixes GPU driver freezes instantly). If completely unresponsive, hold the power button for 10 seconds. After it restarts, check Event Viewer → Windows Logs → System for Error events at the time of the freeze. Disable Fast Startup in Power Options if freezes are recurring.

How do I stop pop-ups and annoying ads on my computer?

Full-screen browser alerts saying 'call this number' are scams. Close the tab with Alt+F4. Check browser notification subscriptions in Chrome at chrome://settings/content/notifications and remove unknown sites. Check your browser extensions at chrome://extensions and remove any you didn't deliberately install. Right-click your browser shortcut → Properties and make sure the Target field ends with .exe with nothing after it. Run AdwCleaner (free, by Malwarebytes) to remove adware. Install uBlock Origin to prevent future ads.

What do I do if I can't log in to my computer?

Check Caps Lock: it's the most common cause of failed passwords. Check your keyboard language, it may have switched (Windows + Space), making some characters type differently. Use the 'show password' eye icon to see exactly what you're typing. Click 'Forgot password?' and check your email spam folder for the reset link. On Windows, your PIN and Microsoft account password are separate. 'I forgot my PIN' handles PIN issues. Check your Wi-Fi connection before logging in to online accounts, as authentication fails without internet.

How do I free up storage space on my computer?

Empty the Recycle Bin first: deleted files still take up space until it's emptied. Run Disk Cleanup, then click 'Clean up system files'. Look for 'Previous Windows installation(s)' which can be 15-30 GB after an upgrade. Press Windows+R, type %temp%, and delete everything there. Download TreeSize Free to visually see which folders are taking the most space. Check if hiberfil.sys exists (hibernate file, often 8-16 GB). Disable hibernation with 'powercfg /hibernate off' if you don't use it.

How do I fix a printer that's not working?

Check the printer is on, connected (USB or same Wi-Fi), has paper, and has no error light. Open services.msc, find Print Spooler, and restart it. Clear stuck print jobs by stopping the spooler, deleting files from C:\Windows\System32\spool\PRINTERS, then restarting the spooler. Make sure the correct printer is selected, not Microsoft Print to PDF or a disconnected old printer. For Wi-Fi printers, reconnect to your router via the printer's display after any router restart and re-add the printer in Windows.

How do I fix a browser that won't load pages?

Try a Private/Incognito window first (Ctrl+Shift+N). If pages load there, the problem is an extension or cache. Test a different browser to isolate whether it's browser-specific or a Windows networking issue. Clear cache with Ctrl+Shift+Delete, select 'All time'. Check Settings → Proxy and make sure 'Use a proxy server' is Off. Run ipconfig /flushdns and netsh winsock reset in Command Prompt as administrator. If SSL errors appear on every site, check that your system clock is correct.

How do I fix a laptop battery that drains too fast?

Run 'powercfg /batteryreport' in Command Prompt as administrator to see your battery's actual health vs its design capacity. Change your Power Mode to Balanced in Settings → Power & battery. Lower screen brightness: the display is the single biggest battery drain. Run 'powercfg /sleepstudy' to identify what's draining battery while the laptop sleeps. Turn off Bluetooth when not in use. Check Settings → Power & battery → Battery usage to see which apps are using the most power.

What should I do if my computer is making strange noises?

Rhythmic clicking or grinding from inside the computer means your hard drive is failing. Stop using it and back up your files immediately to an external drive or cloud storage. Download CrystalDiskInfo to check your drive's S.M.A.R.T. health data and look for 'Caution' or 'Bad' status. Loud fan noise usually means the CPU is overheating. Check Task Manager for high CPU usage, and make sure vents aren't blocked (never use a laptop on a bed or sofa). Beeping on startup is a hardware error code: search '[your laptop brand] + beep codes'. A high-pitched whine (coil whine) is usually harmless.

How do I recover an accidentally deleted file?

Stop using the computer immediately: every file written reduces recovery chances. Check the Recycle Bin first. Try Ctrl+Z in File Explorer to undo recent deletions. Right-click the folder the file was in → Properties → Previous Versions tab. If System Protection was on, you may find a snapshot. Check cloud recycle bins: OneDrive, Google Drive, and Dropbox all have their own trash that keeps files for 30+ days. For permanently deleted files, use Recuva (free) and save recovered files to a different drive, not the one you're recovering from. Note: SSDs use TRIM which may wipe deleted data quickly.

How do I fix an app that keeps crashing or won't open?

End the app fully in Task Manager (not just clicking X) and try again. Check Event Viewer → Windows Logs → Application for Error events at the crash time. This often names the exact cause. Install Microsoft Visual C++ Redistributables (both x64 and x86, 2015-2022): missing runtime libraries cause many app crashes with no error message. Try running the app as administrator. Clear corrupted config by pressing Windows+R, typing %appdata%, and renaming the app's folder. For a clean reinstall, also delete the app's folder from %appdata% and %localappdata% before reinstalling.

What should I do if I get a virus or malware warning?

If it's a large browser pop-up with a phone number, it's a scam, not a real warning. Close the tab with Alt+F4. Real Windows Security alerts are small notifications in the corner and never include phone numbers. Run Windows Security (search 'Windows Security') → Virus & threat protection → Full scan. Also run Malwarebytes (free) which catches adware and browser hijackers that Defender misses. Run ESET Online Scanner for an independent second opinion. If real malware was found, change important passwords from a different device and check bank statements.

How do I fix Windows Update when it's stuck or failing?

Give it at least 90 minutes: major updates are genuinely slow. Check your system date and time are correct (right-click the clock → Adjust date/time → Sync now). Wrong clocks break Windows Update certificate verification. Run the Windows Update Troubleshooter in Settings → System → Troubleshoot. Run 'DISM /Online /Cleanup-Image /RestoreHealth' then 'sfc /scannow' in Command Prompt as administrator. Corrupted system files commonly block updates. Make sure C: has at least 15 GB free. For updates that keep failing, use Microsoft's Update Assistant tool.

How do I fix Outlook or email that's not working?

Test outlook.com in your browser first. If webmail works but the app doesn't, the problem is Outlook, not your account. Look at the bottom of the Outlook window for 'Working Offline'. Click Send/Receive → Work Offline to toggle it off. Check Windows Credential Manager for saved Outlook passwords and remove any old ones. Delete anything stuck in your Outbox (a single large email blocks all sending). Run the Inbox Repair Tool (scanpst.exe) to fix corrupted .pst files. If you have two-factor authentication, you may need an app-specific password from your email provider.

How do I update my web browser?

In Chrome: click the three dots → Help → About Google Chrome. It updates automatically. Click 'Relaunch to update'. In Edge: three dots → Help and feedback → About Microsoft Edge. In Firefox: three lines → Help → About Firefox. After updating, close all browser windows and reopen to fully apply the update. Keeping your browser updated is critical for security: browsers patch known vulnerabilities every 4 weeks. If the browser won't update on a work computer, it may be controlled by IT policy.

What should I do when I get a Blue Screen of Death (BSOD)?

Write down the stop code shown on the blue screen in capitals, like IRQL_NOT_LESS_OR_EQUAL or MEMORY_MANAGEMENT. That code tells you exactly what broke. IRQL errors usually point to a faulty driver; MEMORY_MANAGEMENT usually means bad RAM. Roll back or update your GPU driver first, as it is the single most common cause. Test your RAM with the built-in Windows Memory Diagnostic (run mdsched from the Run dialog). Run DISM /Online /Cleanup-Image /RestoreHealth then sfc /scannow in Command Prompt as administrator to repair corrupted system files. Use HWiNFO64 to monitor temperatures if crashes only happen under load.

Why won't my computer turn on or show anything on screen?

Check the power cable is fully seated and the monitor is on the correct input (HDMI 1, HDMI 2, or DisplayPort). Drain residual power by unplugging everything and holding the power button for 30 seconds. On a desktop with a dedicated GPU, make sure the monitor is plugged into the GPU ports, not the motherboard video output. Reseat the RAM sticks by removing and firmly reinserting them. Listen for beep codes on startup: multiple beeps indicate a hardware fault before Windows loads. If Windows starts loading then crashes, boot into Safe Mode by holding Shift while clicking Restart.

How do I fix 100% disk usage in Windows Task Manager?

Open Resource Monitor (from Task Manager's Performance tab) and sort the Disk tab by Total to find exactly which process is causing it. Disable the SysMain service in services.msc to stop background preloading. Check your drive health with CrystalDiskInfo: a failing hard drive commonly causes 100% disk usage as it struggles to read bad sectors. Turn off Delivery Optimization in Windows Update settings so Windows stops using your disk to distribute updates to other PCs. If virtual memory is on a slow HDD, adjust the pagefile settings or move it to an SSD.

How do I fix a USB device that's not recognized?

Try a different USB port, specifically the ports on the back panel of a desktop, which are more reliable than front-panel ports. Open Device Manager and look for yellow exclamation marks under Universal Serial Bus controllers or Unknown devices. Disable USB Selective Suspend in advanced power settings so Windows stops cutting power to USB ports. Uninstall all USB Root Hubs and USB Host Controllers in Device Manager and restart so Windows reinstalls them fresh. If an external drive keeps disconnecting, try a powered USB hub, as some drives need more power than a single laptop port can supply.

How do I fix my webcam not working?

Check the physical privacy shutter on your laptop if it has one: a small slider above the camera lens that blocks it entirely. Go to Settings → Privacy and security → Camera and make sure camera access is turned on for both the system and your specific apps. Close Teams, Zoom, Discord, OBS, and any other video app completely, since only one app can use the webcam at a time. Test with the built-in Windows Camera app to see if the camera works at all. In Device Manager, uninstall the webcam under Cameras and restart to reinstall the driver fresh.

Why does my Wi-Fi keep disconnecting?

The most common fix is disabling power management on the Wi-Fi adapter: in Device Manager, right-click the adapter, go to Power Management, and untick 'Allow the computer to turn off this device to save power'. Update the Wi-Fi driver from your laptop manufacturer's support site, as outdated drivers have known disconnection bugs. Change the Roaming Aggressiveness setting in the adapter's Advanced properties to Medium. Forget the network and reconnect fresh to get a new DHCP lease. Check whether other devices drop the same network at the same time: if they do, restart the router.

How do I fix Bluetooth that won't connect or pair?

Remove the device completely from Settings → Bluetooth and devices, then re-pair from scratch. Make sure the Bluetooth device is actively in pairing mode, not just turned on: usually hold the Bluetooth or power button for 5-10 seconds until the indicator light flashes. Restart the Bluetooth Support Service in services.msc. Update the Bluetooth driver through Device Manager. If a wireless mouse or keyboard keeps dropping, move its USB dongle to a USB 2.0 port away from USB 3.0 devices, which emit interference at the same 2.4GHz frequency Bluetooth uses.

How do I fix a flickering computer screen?

Open Task Manager and watch whether it flickers too. If Task Manager also flickers, the cause is the GPU driver or hardware. Roll back or reinstall the GPU driver using DDU (Display Driver Uninstaller) in Safe Mode for a clean install. Try a different display cable. If Task Manager stays solid while the rest of the screen flickers, the cause is a specific program such as antivirus software or iCloud for Windows. Disable hardware acceleration in your browser (Settings → System) and check for incompatible Explorer shell extensions using ShellExView.

How do I get Windows to detect my second monitor?

On a desktop with a dedicated GPU, plug the monitor into the GPU ports, not the motherboard video outputs, which are usually disabled when a GPU is installed. Press Windows + P and make sure the projection is not set to 'PC screen only'. Go to Display settings and click Detect. Try a different cable, and try switching between HDMI and DisplayPort if both your GPU and monitor support them. Update your GPU driver. Test the monitor on another device to confirm the monitor itself works.

Why is my right-click menu not working?

Restart Explorer.exe without rebooting: open Task Manager → Details → right-click explorer.exe → End task, then File → Run new task → type explorer.exe. If that does not fix it, a broken shell extension from installed software like 7-Zip, WinRAR, or antivirus is the likely cause. Download ShellExView, disable all non-Microsoft shell extensions with F7, and test. If right-click works, re-enable extensions one at a time to find the broken one. On Windows 11, common options from installed programs are hidden under 'Show more options' at the bottom of the new simplified right-click menu.

Why does my keyboard or mouse stop working randomly?

The most common cause is USB Selective Suspend: Windows cuts power to idle USB ports and sometimes fails to restore it. Disable USB Selective Suspend in advanced power settings and also untick 'Allow the computer to turn off this device to save power' for each USB Root Hub in Device Manager. On a desktop, plug keyboard and mouse into back-panel ports directly on the motherboard rather than front-panel ports or hubs. For wireless devices, move the USB receiver to a USB 2.0 port away from USB 3.0 devices, which interfere with 2.4GHz wireless signals.

How do I fix 'Windows is not activated'?

Go to Settings → System → Activation and run the Activation Troubleshooter, which contacts Microsoft's servers and reactivates automatically for most common issues. Link your Windows licence to a Microsoft account so it can survive hardware changes. From Command Prompt as administrator, run slmgr /ato to force an immediate activation attempt. If you replaced the motherboard, run slui 4 to start phone activation: an automated call where you read an installation ID and receive a confirmation ID. If you purchased a key for under $15 from a third-party marketplace, it is likely an invalid OEM or volume key that Microsoft has deactivated.

How do I fix a microphone that is not working in Windows?

Check for a physical mute button or LED on your headset or microphone first. If the LED is red, the mic is muted at the hardware level and no software change will help. Go to Settings, Privacy and security, Microphone and make sure both the system-wide toggle and your specific app's toggle are on. Right-click the speaker icon, open Sound settings, and confirm the correct input device is selected with its volume slider above zero. Check your app's own microphone selector in its settings: Teams, Zoom, and Discord each have their own device selector independent of Windows. If none of this works, go to Device Manager and reinstall the audio driver.

How do I stop my laptop from overheating?

Always use the laptop on a hard, flat surface so the underside intake vents are not blocked. Download HWiNFO64 to check actual CPU and GPU temperatures: above 95C on a CPU under load means it is thermal throttling. Open Task Manager sorted by CPU to find any background process causing constant high CPU usage. Switch the power plan from High Performance to Balanced. Clean the exhaust vents with a can of compressed air, pointing from the outside in short bursts. On a laptop older than 3 years, the thermal paste between the CPU and heatsink may have dried out and cracked: replacing it can drop temperatures by 20C or more but requires partial disassembly.

Why does my computer keep restarting on its own?

Open Event Viewer (press Windows + R, type eventvwr) and look for Kernel-Power Event ID 41 in Windows Logs → System. This confirms the restart was unplanned. Check the minutes before the event for clues. Go to Settings → Windows Update → Advanced options and set Active hours so Windows does not restart during your usage time. If restarts only happen under load, overheating is likely the cause: use HWiNFO64 to check temperatures. Disable automatic restart after BSOD in Advanced System Settings so the stop code is visible next time. Test RAM with mdsched. Run DISM and SFC to repair corrupted system files. On a desktop, a failing power supply causes sudden shutoffs that look like random restarts.

How do I fix a Mac that is running slow?

Restart properly via the Apple menu, unticking 'Reopen windows when logging back in'. Open Activity Monitor and check the CPU tab: mds_stores means Spotlight is reindexing after an update (safe, wait overnight); kernel_task at high CPU means thermal throttling (a symptom, not the cause). Check the Memory tab Memory Pressure graph: red means the Mac is out of RAM and swapping to disk, which causes the spinning beach ball. Go to System Settings → General → Login Items and Extensions and remove startup apps you do not need at login. Confirm your drive has at least 10-15% free space. Boot into Safe Mode (hold Shift on Intel, or hold power button until startup options appear on Apple Silicon) to test whether a third-party app is the cause. For Intel Macs: reset the SMC if the fan runs at full speed for no reason or battery percentage is erratic.

How do I fix Mac WiFi that is not working?

Start with a ping test in Terminal: ping -c 4 8.8.8.8 tests the connection itself, ping -c 4 google.com tests DNS. If the first succeeds but the second fails, DNS is the problem, not WiFi. Toggle WiFi off and on from the menu bar. If that does not help, forget the network: System Settings → WiFi → info button → Forget This Network, then reconnect for a fresh DHCP lease. Change DNS to 1.1.1.1: System Settings → WiFi → info button → DNS → add 1.1.1.1. If the IP address starts with 169.254 after renewing DHCP, your Mac cannot reach the router at all. Hold the Option key and click the WiFi icon to open Wireless Diagnostics, which identifies channel congestion and signal issues. Delete corrupted preference files in /Library/Preferences/SystemConfiguration/ and restart. If problems persist, open Keychain Access and delete the saved AirPort network password for your network, then reconnect fresh.

How do I fix no sound on a Mac?

Go to System Settings → Sound → Output and check the selected device: macOS silently switches to HDMI, Bluetooth, or virtual outputs. If you used Bluetooth headphones recently, click Control Centre in the menu bar and switch the output back to MacBook Speakers. On Macs with a headphone jack, the jack sensor can stick in the plugged-in position: plug wired headphones in and out several times to reset it. Open Audio MIDI Setup and confirm the format is 44100 Hz or 48000 Hz in stereo. Restart Core Audio by opening Terminal and running: sudo killall coreaudiod. It restarts automatically within seconds. Check app-specific audio selectors in Zoom, Discord, and Google Meet, as each has its own output device setting independent of the system. Boot into Safe Mode to test whether a third-party audio extension (Boom 3D, eqMac, BlackHole) is the cause.

How do I free up storage space on a Mac?

Open Apple menu → About This Mac → More Info → Storage Settings to see the breakdown. Empty the Trash including app-specific trash: Photos menu → Recently Deleted, and iMovie's own library trash. Sort Downloads by size and delete disk images (.dmg), old installers, and archives. Delete Time Machine local snapshots, which silently consume 10-50 GB: open Terminal and run sudo tmutil deletelocalsnapshots / then check if System Data shrinks. Delete old iPhone and iPad backups stored in ~/Library/Application Support/MobileSync/Backup, typically 10-30 GB each, by clicking your device in Finder and choosing Manage Backups. Enable Optimise Storage so macOS offloads older iCloud files automatically. Use OmniDiskSweeper (free) to find hidden large files like Xcode derived data in ~/Library/Developer/Xcode/DerivedData and Docker images. Run brew cleanup in Terminal to remove old Homebrew package versions.

What should I do if my Mac will not start?

Check the power adapter is seated and try a different outlet: a flat battery looks identical to a dead Mac. A blinking folder with a question mark means macOS cannot find its startup disk: enter Recovery Mode and open Startup Disk to reselect it, or run Disk Utility First Aid. Try Safe Mode: Intel Macs hold Shift after pressing power; Apple Silicon hold the power button until startup options appear, select the disk, hold Shift, click Continue in Safe Mode. If Safe Mode works, a third-party kernel extension is preventing normal startup. On Intel Macs, reset NVRAM by holding Command + Option + P + R for 20 seconds on startup. Enter Recovery Mode (Intel: Command + R; Apple Silicon: hold power button until Options appears) and run Disk Utility First Aid to repair file system errors. If Disk Utility finds no errors, use Reinstall macOS from Recovery to replace system files without erasing personal data. If the Mac will not boot at all and you have unsaved data, use Target Disk Mode to access the drive from another Mac before attempting any further repairs.

How do I fix a Linux computer that is running slow?

Run htop (sudo apt install htop on Ubuntu/Debian) and sort by CPU% to find the culprit: tracker-miner-fs is the GNOME file indexer and finishes on its own; kworker at high CPU usually signals a hardware device in a bad state. Run free -h to check RAM: if available memory is under 200 MB and swap is in use, the system is swapping to disk which makes everything slow. Reduce swappiness: sudo sysctl vm.swappiness=10. Check the CPU governor: cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor. If it says powersave, switch to performance with sudo cpupower frequency-set -g performance. Disable unneeded services with sudo systemctl disable --now servicename. Check drive health with sudo smartctl -a /dev/sda and look for Reallocated_Sector_Ct above zero. Run sudo dmesg -T | grep -iE error|fail|reset to find kernel-level hardware errors causing silent slowdowns. Clear package caches with sudo apt autoremove and sudo apt clean.

How do I fix Linux WiFi that is not working?

Run rfkill list in a terminal. Soft blocked: yes means run rfkill unblock wifi. Hard blocked: yes means a physical switch or Fn key has disabled WiFi at the hardware level. Run nmcli device status: unmanaged means NetworkManager is not controlling the adapter, unavailable means the driver is not loaded. Connect from the command line: nmcli device wifi connect 'NetworkName' password 'YourPassword'. If the adapter shows as UNCLAIMED in sudo lshw -C network, the driver is missing. On Ubuntu run sudo ubuntu-drivers install for all recommended drivers. A commonly skipped fix: install missing firmware packages with sudo apt install linux-firmware firmware-misc-nonfree on Debian/Ubuntu or sudo dnf install linux-firmware on Fedora. Many WiFi chips load the driver successfully but cannot initialise the radio without the firmware binary. If ping 8.8.8.8 works but ping google.com fails, the connection is up but DNS is broken: run nmcli con modify 'ConnectionName' ipv4.dns '1.1.1.1 1.0.0.1' then nmcli con up 'ConnectionName'. Restart NetworkManager with sudo systemctl restart NetworkManager if everything looks right but WiFi is still not connecting.

Why is my laptop not charging even when plugged in?

Wiggle the cable connector at both ends and try a known-good charger first. Check the charger wattage matches what your laptop requires (printed on the bottom of the laptop). Dell, ASUS, Lenovo, HP, and Samsung all ship software that caps the battery at 60-80% to extend lifespan: open your OEM app (Lenovo Vantage, Dell Command, MyASUS, HP Smart) and disable Battery Conservation or Care Mode. Run powercfg /batteryreport in Command Prompt as administrator to check battery wear: if Full Charge Capacity is below 60% of Design Capacity, the battery needs replacing. In Device Manager, expand Batteries, right-click Microsoft ACPI-Compliant Control Method Battery, uninstall it, and restart to reinstall the driver. Clean the charging port with a wooden toothpick. If nothing works, update the BIOS from the manufacturer's support page and test directly on a wall outlet instead of a power strip.

How do I fix a GPU driver crash or black screen display driver error?

Open Event Viewer and look in Windows Logs, System for errors with source nvlddmkm (NVIDIA), amdkmdag (AMD), or igfx (Intel) timestamped at the moment of the crash. Download HWiNFO64 and check GPU temperature under load: if it exceeds 90°C for NVIDIA or 95°C for AMD, clean the vents before touching drivers. Download DDU (Display Driver Uninstaller) from Guru3D and save it to your Desktop. Download the latest driver from nvidia.com or amd.com and save it to your Desktop too. Boot into Safe Mode by holding Shift while clicking Restart, then going to Troubleshoot, Advanced options, Startup Settings, and pressing 4. In Safe Mode, run DDU and choose Clean and do not restart. When DDU finishes, restart and install the new driver using Custom installation with Perform a clean installation ticked.

How do I fix a PC black screen with no display?

On a desktop with a dedicated GPU, plug the monitor into the GPU ports (the lower card slot), not the motherboard video outputs, which are disabled when a GPU is installed. Try a different HDMI or DisplayPort cable and a different port on the GPU. If the PC is running but the screen is black, press Win + Ctrl + Shift + B to reset the display driver without restarting. Disable Fast Startup in Control Panel, Power Options, Choose what the power buttons do, and untick Turn on fast startup. Boot into Safe Mode by holding Shift while clicking Restart: if the screen works there, the GPU driver or a startup program is the cause. In Safe Mode, roll back the GPU driver in Device Manager under Display Adapters. Reseat the RAM sticks by removing them fully and pressing them back in until both clips lock.

How do I fix game lag, FPS drops, and stuttering?

Turn on the in-game FPS counter first to confirm FPS is actually dropping, not just network lag. Enable Windows Game Mode in Settings, Gaming, Game Mode. Turn off Record in the background in Settings, Gaming, Captures: this runs a constant screen capture that takes real CPU and GPU resources. Close browsers, Discord, and OneDrive before launching the game. Download HWiNFO64 and check GPU and CPU temperatures under load: above 85-90°C means thermal throttling is cutting performance. Set the power plan to High Performance in Control Panel, Power Options. Confirm your monitor refresh rate is set to its maximum in Display Settings, Advanced display settings. Update GPU drivers via GeForce Experience or AMD Adrenalin and verify game files in Steam by right-clicking the game, Properties, Local Files, Verify integrity.

How do I fix high ping while gaming?

Check fast.com in a browser first: if download speed is fine there but in-game ping is high, the problem is game-server routing, not your internet speed. Switch from WiFi to a wired Ethernet cable: WiFi adds 10-40ms of latency from the wireless protocol alone. Close Windows Update, Steam downloads, and OneDrive before gaming. Check the game's region settings: connecting to US servers from Europe gives 100ms+ no matter what. Change DNS to 1.1.1.1 (Cloudflare) in Settings, Network, your connection, DNS server assignment. Enable QoS on your router admin panel and set your PC's IP to high priority. Unplug both the router and modem from the wall for 30 seconds and plug back in.

How do I fix the Windows 11 Start Menu or Taskbar not working?

Open Task Manager with Ctrl + Shift + Esc, find Windows Explorer in the Processes list, right-click it and click Restart. This resets the entire shell in about 3 seconds. Check Settings, Windows Update for pending updates: Start Menu breaks are often caused by an incomplete update and fixed by the next one. In PowerShell as administrator, run: Get-AppxPackage -AllUsers Microsoft.Windows.ShellExperienceHost | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register "$($_.InstallLocation)\AppXManifest.xml"} and restart. Run sfc /scannow in PowerShell as administrator, then DISM /Online /Cleanup-Image /RestoreHealth. If the problem started after a specific update, uninstall it from Settings, Windows Update, Update history, Uninstall updates.

How do I fix WiFi that won't connect or shows no networks?

Open Device Manager and expand Network Adapters: a yellow warning triangle on the WiFi adapter means the driver is broken, no adapter listed means the driver is missing. Toggle Airplane Mode on for 10 seconds then off to power-cycle the WiFi radio. Go to Settings, Network, WiFi, Manage known networks, find your network and click Forget, then reconnect fresh. Open Command Prompt as administrator and run these one at a time: netsh winsock reset, netsh int ip reset, ipconfig /release, ipconfig /flushdns, then restart. In Device Manager, right-click the WiFi adapter and update the driver, or roll it back if the problem started after a Windows Update. Untick Allow the computer to turn off this device to save power in the adapter's Power Management properties. As a last resort, go to Settings, Network, Advanced network settings, Network reset.

How do I fix a laptop touchpad that stopped working?

Press the Fn key plus the touchpad key (often Fn + F5 or Fn + F9) to toggle it back on: this is the most common cause by far. Unplug any external USB or Bluetooth mouse, as some laptops disable the touchpad when an external mouse is detected. Open Settings, Bluetooth and devices, Touchpad and make sure the toggle is on. In Device Manager, find the touchpad under Human Interface Devices or Mice and other pointing devices, right-click it, disable it, wait 10 seconds, then enable it again. Update the driver from Device Manager, or download it directly from your laptop manufacturer's support page. Roll back the driver if the problem started after a Windows Update. Run msdt.exe -id DeviceDiagnostic in Command Prompt as administrator for the Hardware and Devices troubleshooter.

How do I fix a PC that won't sleep or won't wake from sleep?

Run powercfg /requests in Command Prompt as administrator to see what is blocking sleep right now. Run powercfg /lastwake to find what woke the PC last time. In Device Manager, for every mouse, keyboard, and USB hub, go to Properties, Power Management and untick Allow this device to wake the computer. Do the same for the network adapter, and disable Wake on Magic Packet in its Advanced properties. If the PC wakes but the screen is black, press Win + Ctrl + Shift + B to reset the display driver. Check that Put the computer to sleep is not set to Never in your power plan. On desktops, set Allow hybrid sleep to Off in advanced power settings. Update chipset drivers from the motherboard manufacturer's site.

How do I fix an external hard drive or USB drive that won't show up?

Open Disk Management (Win + X, Disk Management), not File Explorer: it shows drives without letters or partitions that File Explorer hides. If the drive shows but has no letter, right-click the volume and choose Change Drive Letter and Paths, Add. If it shows as Unallocated and the drive is new, right-click and create a New Simple Volume. If the drive was formatted on a Mac using HFS+ format, Windows cannot read it natively: copy the files off on a Mac and reformat as exFAT. Try a different USB port and cable. Run chkdsk X: /f /r in Command Prompt as administrator where X is the drive letter, to scan for file system errors and bad sectors. If the drive does not appear in the BIOS, the problem is hardware, not software.

How do I fix Windows Search when it stops working?

Open services.msc (Win + R, type services.msc), find Windows Search, right-click it and click Restart. Run the Search and Indexing troubleshooter in Settings, System, Troubleshoot. Rebuild the search index in Control Panel, Indexing Options, Advanced, Rebuild: this takes 30-60 minutes but fixes most missing-result problems. In PowerShell as administrator, run: Get-AppxPackage -AllUsers Microsoft.Windows.Search | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register "$($_.InstallLocation)\AppXManifest.xml"} and restart. Run sfc /scannow to repair corrupted search files. Install all pending Windows Updates. If Search works in a new user account but not yours, delete the folder C:\Users\[username]\AppData\Local\Packages\Microsoft.Windows.Search_* and restart.

How do I fix copy and paste when it stops working?

Open Task Manager, find Windows Explorer, right-click and click Restart: Explorer manages the clipboard and restarting it fixes most temporary clipboard breaks. Find rdpclip.exe in Task Manager Details tab, end it, then run it again via File, Run new task, rdpclip.exe. Go to Settings, System, Clipboard, click Clear, then toggle Clipboard history off and back on. Close applications one at a time and test paste after each: browsers, password managers, screen capture tools, and video call apps commonly lock the clipboard. Run sfc /scannow in PowerShell as administrator to fix corrupted clipboard DLLs. Uninstall any third-party clipboard manager software like Ditto or ClipX, which conflict with the built-in Windows Clipboard history.

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Before you call a repair shop

Free computer health check. Find out what's wrong and fix it.

Updated June 2026

Try this before paying someone. Step-by-step fixes for common PC problems, in plain English. Everything runs on your device. Nothing is uploaded.

Windows

Mac

Linux

About CalmPC & all 75 fix guides

Free computer troubleshooting guides for Windows, Mac, and Linux in 2026

Updated June 2026

CalmPC is the free, browser-based PC health checker for 2026: open it in any browser, run the scan, and get step-by-step fixes for the most common Windows, Mac, and Linux problems, all without downloading anything or creating an account. Nothing leaves your device.

CalmPC is built and maintained by Clive Makazhu, a self-taught developer with 15 years of experience and CompTIA A+ and CompTIA Network+ certifications, based in Johannesburg, South Africa. The guides come from direct, hands-on experience fixing real computers, not documentation summaries.

The health check tests your computer's performance, browser compatibility, internet connection speed, and camera and microphone permissions. You get an instant health score with specific fixes for anything that needs attention. Guides cover Windows 10 and 11, macOS, and common Linux distributions.

The built-in network speed test measures ping (your connection's response time in milliseconds) and download speed in Mbps using Cloudflare's servers. Nothing is uploaded. Your result is rated fast, average, or slow, and if your connection needs attention the health check links you straight to the relevant fix guide. The test runs entirely in your browser with no account, no install, and no data leaving your device.

Speed & Performance

Computer running slow: restart properly, check Task Manager, power plan, disk space, SFC scan, thermal throttling
App keeps crashing: Event Viewer diagnosis, Visual C++ Redistributables, AppData cleanup, run as administrator
Running out of storage space: Disk Cleanup, Windows.old folder, hiberfil.sys, TreeSize Free, Temp folder
100% disk usage: Resource Monitor to find culprit, disable SysMain, CrystalDiskInfo SMART check, Delivery Optimization, pagefile settings
Blue Screen of Death (BSOD): stop code lookup, GPU driver rollback, RAM test with mdsched and Memtest86, SFC and DISM, HWiNFO64 temperature check
Right-click menu not working: Explorer.exe restart, ShellExView shell extension audit, SFC scan, clean boot, Windows 11 context menu fix
Computer keeps restarting: Kernel-Power 41 in Event Viewer, Windows Update active hours, thermal shutdown diagnosis with HWiNFO64, disable auto-restart to reveal BSOD stop code, RAM test with mdsched, SFC and DISM, PSU fault diagnosis
Game lag, FPS drops, and stuttering: FPS counter to separate from network lag, Windows Game Mode, disable Xbox background recording, close bandwidth hogs, HWiNFO64 temperature check for thermal throttling, High Performance power plan, monitor refresh rate match, verify game files in Steam or Epic
Start Menu or Taskbar not working (Windows 11): Windows Explorer restart in Task Manager, pending Windows Update check, PowerShell ShellExperienceHost re-registration, new user account test, SFC scan, DISM RestoreHealth, uninstall problematic update, Reset this PC with Keep my files
Windows Search not working: Windows Search service restart in services.msc, Search and Indexing troubleshooter, index rebuild in Control Panel Indexing Options, PowerShell Windows Search app re-registration, Group Policy registry check, SFC scan, Windows Update
Copy and paste not working: Windows Explorer restart, rdpclip.exe restart, Clipboard history clear, find clipboard-locking app, Group Policy Clipboard redirection check, SFC scan, remove third-party clipboard managers, app-specific clipboard settings
Game won't launch: read the error message first (DLL, DirectX, anti-cheat), install Visual C++ Redistributables and DirectX End-User Runtime, verify game files in Steam or Epic, run as administrator, add game folder to antivirus exclusions, repair Easy Anti-Cheat or BattlEye from game folder, Event Viewer faulting module lookup for silent crashes

Internet & Browser

Slow or no internet: router restart, 2.4GHz vs 5GHz, DNS to 1.1.1.1, netsh winsock reset, ISP throttling test
Browser won't load pages: Private window test, proxy settings, DNS flush, SSL certificate issues, extensions
Browser needs updating: Chrome, Edge, and Firefox update guides, enterprise-managed browser scenarios
Wi-Fi keeps disconnecting: adapter power management, driver update, roaming aggressiveness, forget and reconnect, 2.4GHz vs 5GHz band, router firmware
High ping while gaming: confirm FPS vs network lag, switch to Ethernet, close background bandwidth users, correct game server region, DNS to 1.1.1.1, QoS on router, router and modem reboot, ISP routing test with WinMTR
WiFi won't connect or no networks found: Device Manager adapter check, Airplane Mode toggle, forget and reconnect network, netsh winsock reset and ipconfig /flushdns, update or roll back WiFi driver, disable power management on adapter, network troubleshooter, full network reset
VPN not connecting: Remote Access Connection Manager and SSTP service check in services.msc, uninstall and clean reinstall with TAP and WireGuard adapter removal from Device Manager, delete and recreate the VPN profile, netsh winsock reset, firewall exception for the VPN executable, switch VPN protocol (OpenVPN TCP 443 bypasses most blocks), mobile hotspot test for ISP blocking

Sound & Display

Sound not working: output device, audio enhancements, exclusive control, Volume Mixer, driver reinstall
Microphone not working: physical mute button and LED, correct input device selection, two-layer Windows microphone privacy settings, app-level mic selector in Teams/Zoom/Discord, microphone boost levels, audio driver reinstall
Screen frozen or unresponsive: GPU driver reset shortcut, Event Viewer, Fast Startup, RAM test with Memtest86
Screen flickering: Task Manager flicker test to isolate cause, GPU driver rollback with DDU, refresh rate, display cable, hardware acceleration, shell extension conflicts
Second monitor not detected: GPU port vs motherboard port, Windows + P projection, Detect button, cable swap, GPU driver update

Security & Access

Virus or malware warning: spot real vs scam alerts, Windows Defender Offline scan, Malwarebytes, ESET Online Scanner
Pop-ups and annoying ads: browser notifications, extension adware, shortcut hijacking, AdwCleaner, uBlock Origin
Can't log in: Caps Lock, keyboard layout, PIN vs password, Credential Manager, Safe Mode recovery
Windows not activated: Activation Troubleshooter, link to Microsoft account, slmgr /ato, phone activation via slui 4, invalid third-party key warning
Windows Hello not working (fingerprint or face): check enrollment in Sign-in options, remove and re-enroll biometrics, update biometric driver in Device Manager, download manufacturer driver (Dell, Lenovo, HP, ASUS), Windows Biometric Service check in services.msc, Group Policy biometrics policy check, Windows Hello PIN reset and re-enroll, optional driver updates in Windows Update
Browser notification spam: find allowed notification sites in chrome://settings/content/notifications or about:preferences#privacy, remove unrecognised entries, set default to block all future requests, check clipboard-read access, enable Chrome quieter messaging to silence prompts without blocking entirely
Unknown background browser scripts (service workers): open F12 DevTools, Application tab, Service workers in Chrome or Edge to see installed workers, Unregister anything unrecognised, use Storage section to clear all site data for suspicious origins, Firefox equivalent at about:debugging, full clear with chrome://settings/clearBrowserData as last resort
Windows Recall taking screenshots (Copilot+ PCs only): Settings, Privacy & security, Recall & snapshots to check Save snapshots toggle and disk usage, Delete all snapshots to reclaim disk space, Settings, System, Optional features to uninstall Recall entirely, or Dism /Online /Disable-Feature /FeatureName:Recall in PowerShell as administrator

Hardware & Devices

Computer making strange noises: CrystalDiskInfo SMART check, clicking drive backup warning, coil whine, fan noise, beep codes
Printer not working: Print Spooler restart, spool folder clear, Wi-Fi reconnection, manufacturer driver install
Laptop battery draining too fast: powercfg batteryreport, sleepstudy, power modes, lithium battery health
USB device not recognized: back-panel ports, Device Manager errors, USB Selective Suspend, reinstall USB controllers, powered hub for external drives
Bluetooth not connecting: remove and re-pair, pairing mode, Bluetooth Support Service, driver update, USB 3.0 interference fix
Keyboard or mouse stops working: USB Selective Suspend, USB Root Hub power management, back-panel ports, wireless receiver interference, HID driver update
Webcam not working: physical privacy shutter, camera privacy settings, close competing apps, Windows Camera app test, driver reinstall
Computer won't turn on: power and monitor cable check, capacitor drain, beep codes, RAM reseating, GPU removal test, Safe Mode
Laptop running hot or overheating: hard flat surface and unblocked vents, HWiNFO64 temperature monitoring, background CPU culprit in Task Manager, Balanced power plan, compressed air vent cleaning, cooling pad, thermal paste replacement for older laptops
Laptop not charging: cable and brick test, wattage match check, OEM battery conservation mode (Dell Command, Lenovo Vantage, MyASUS, HP Smart), powercfg /batteryreport design vs full charge capacity, ACPI battery driver reinstall in Device Manager, charging port cleaning, BIOS update, direct outlet test
GPU driver crash or display driver error: Event Viewer nvlddmkm/amdkmdag source confirmation, HWiNFO64 temperature check, DDU from Guru3D download, driver download before Safe Mode, DDU clean removal in Safe Mode, custom clean installation of new driver, FurMark load test
PC black screen with no display: GPU port vs motherboard port, cable and port swap, Fast Startup disable, Win+Ctrl+Shift+B display driver reset, Safe Mode isolation, GPU driver roll back with DDU, RAM reseating, POST beep code diagnosis
Laptop touchpad not working: Fn key touchpad toggle, external mouse disconnection, Settings touchpad toggle, driver disable/enable cycle in Device Manager, manufacturer driver from support site, driver roll back, BIOS update, Hardware and Devices troubleshooter (msdt.exe -id DeviceDiagnostic)
PC won't sleep or keeps waking: powercfg /requests to find sleep blockers, powercfg /lastwake to find wake source, USB device wake power management, network adapter Wake on Magic Packet, Win+Ctrl+Shift+B for black screen after wake, Fast Startup disable, chipset driver update, Windows Update for sleep regression patches
External hard drive or USB drive not showing up: Disk Management vs File Explorer distinction, drive letter assignment, New Simple Volume for unallocated drives, HFS+ format incompatibility with Windows, back-panel port and cable swap, USB and storage controller driver update, BIOS detection check, chkdsk /f /r for bad sectors
SSD or hard drive not detected: BIOS storage section check first, SATA cable and power connector swap, M.2 slot protocol compatibility (NVMe vs SATA M.2) in motherboard manual, M.2 and SATA port sharing conflicts, Disk Management initialization for unformatted drives, storage controller driver update from motherboard manufacturer, CrystalDiskInfo SMART health check for reallocated sectors

Files & Updates

Accidentally deleted a file: Recycle Bin, Ctrl+Z undo, Previous Versions, cloud trash, Recuva recovery tool, SSD TRIM warning
Windows Update stuck or failing: date/time sync, DISM RestoreHealth, Update component reset, Update Assistant
Windows 10 end of support: what October 2025 end of support means, PC Health Check compatibility tool, free upgrade path to Windows 11 via Windows Update or Installation Assistant, options for incompatible PCs (Ubuntu Linux, replacement PC), file backup with File History and cloud storage
Outlook or email not working: Working Offline, Credential Manager, Outbox jam, scanpst.exe repair, app passwords for 2FA
OneDrive not syncing: status icon error messages (red X vs yellow triangle), storage quota check (5 GB free limit), invalid file character fix (* : < > ? / \ |), pause and resume sync, sign out and Unlink this PC to clear auth tokens, onedrive.exe /reset to rebuild sync database, Microsoft Store OneDrive update, Choose folders sync selection check

Mac: Speed & Performance

Mac running slow: proper restart with Login Items unticked, Activity Monitor CPU tab (mds_stores reindexing, kernel_task as thermal throttling symptom, WindowServer), Memory Pressure graph (red means disk swap), Login Items cleanup for Ventura and older macOS, storage space check, Safe Mode test to isolate third-party software, SMC reset on Intel Macs
Mac storage full: Storage Management breakdown (System Data category), empty Trash plus Photos and iMovie app-specific trash, Downloads folder sorted by size, Time Machine local snapshots with tmutil deletelocalsnapshots (10-50 GB hidden), iPhone and iPad backups in MobileSync/Backup, Optimise Storage, OmniDiskSweeper for hidden large files, Xcode derived data and simulator runtimes, Homebrew and npm cache cleanup
Mac overheating or fan running loud: Activity Monitor CPU tab for mds_stores, kernel_task, and Chrome Helper processes, hard flat surface and unblocked hinge vents, switch from Chrome to Safari (reduces idle CPU 20-40%), kill backupd and accountsd runaway processes, SMC reset on Intel Macs to recalibrate fan curves, compressed air for older Mac vents, Stats app for actual CPU temperature monitoring
Mac app keeps crashing or won't open: Force quit with Command+Option+Esc and wait 10 seconds, App Store and developer website updates, delete com.company.appname.plist from ~/Library/Preferences, delete Application Support folder for cached data, read crash log in Console app (Crash Reports section) for Exception Type and Faulting module, clean reinstall from App Store or developer website

Mac: Internet & Sound

Mac WiFi not working: ping test to isolate DNS from connection (ping 8.8.8.8 vs ping google.com), toggle WiFi off and on, forget network and reconnect for fresh DHCP, DNS to 1.1.1.1 via System Settings, DHCP lease renewal (169.254 self-assigned address means router unreachable), Wireless Diagnostics via Option+click on WiFi icon, delete corrupted preference files in /Library/Preferences/SystemConfiguration/, Keychain Access to remove stale WiFi password
No sound on Mac: check output device in System Settings (macOS switches silently to HDMI or Bluetooth), Bluetooth still set as active output after headphone use, stuck headphone jack sensor (plug and unplug wired headphones), Audio MIDI Setup sample rate (44100 Hz or 48000 Hz), restart Core Audio with sudo killall coreaudiod, app-specific audio selectors in Zoom and Discord, Safe Mode to rule out third-party audio extensions like Boom 3D or BlackHole
Mac Bluetooth not connecting: toggle Bluetooth off and on, remove and re-pair the device from System Settings Bluetooth, Option+Shift click Bluetooth icon then Debug, Reset the Bluetooth module, delete com.apple.Bluetooth.plist from /Library/Preferences, switch WiFi to 5 GHz to reduce 2.4 GHz interference, move USB 3.0 hubs away from Mac, install pending macOS updates
AirDrop not working: confirm WiFi and Bluetooth both active on both devices, set AirDrop to Everyone in Finder Go AirDrop, wake and unlock receiving device, turn off Personal Hotspot on iPhone, uncheck Block all incoming connections in Mac Firewall settings, disable active Focus modes on receiving device, relaunch Finder with Option right-click on Dock icon

Mac: Display

Mac screen flickering: try a different cable and connect directly without a hub for external displays, disable Automatic graphics switching in Battery Options on Intel dual-GPU MacBook Pros, disable True Tone in System Settings Displays, switch ProMotion to fixed 60Hz refresh rate on MacBook Pro 2021 and later, Safe Mode to isolate third-party display extensions like BetterDisplay, NVRAM reset on Intel Macs with Command+Option+P+R, Apple Diagnostics with D key for hardware fault codes

Mac: Hardware

MacBook not charging: check MagSafe amber or green light, try a different cable (most common cause), match charger wattage to Mac in System Report Power section, disable Optimized Battery Charging in System Settings Battery, clean port with wooden toothpick, SMC reset on Intel Macs with Shift+Control+Option+Power for 10 seconds, check battery cycle count and Condition in System Information Power
Mac battery draining too fast: Activity Monitor Energy tab (Energy Impact and 12 hr Power columns), lower screen brightness (biggest single drain), quit Chrome and Electron apps, disable Bluetooth and Location Services when unused, check battery Condition via Option+click on battery icon, enable Low Power Mode, battery cycle count over 1000 and Service Recommended condition means replacement needed
Mac camera not working: green LED status (hardware indicator cannot be faked), two-level macOS Camera Privacy settings (master toggle and per-app toggle), only one app can use camera at a time so quit all video apps, Photo Booth test to isolate app vs system fault, sudo killall VDCAssistant to restart camera daemon, NVRAM reset on Intel Macs with Option+Command+P+R, macOS Software Update for camera driver fixes
Mac printer not working: remove and re-add printer in System Settings Printers and Scanners, clear stuck jobs in Print Queue with Command+A Delete, right-click empty printer list for Reset printing system option, download latest macOS driver from support.hp.com, usa.canon.com/support, epson.com/support, or support.brother.com, add network printer by IP address via the IP tab, test from TextEdit or Preview to isolate app-specific issues

Mac: Startup

Mac won't start: power cable and port debris check, blinking question mark folder (startup disk missing, fix in Recovery Mode Startup Disk or Disk Utility), Safe Mode (Shift on Intel, hold power button on Apple Silicon), NVRAM reset on Intel (Command+Option+P+R for 20 seconds), Recovery Mode Disk Utility First Aid for file system errors, reinstall macOS from Recovery without data loss, Target Disk Mode to rescue data before repairs

Mac: Files & Security

Accidentally deleted a file on Mac: Trash Put Back and app-specific Trash in Photos (Recently Deleted) and iMovie, Command+Z undo in Finder immediately after deletion, iCloud Drive Recently Deleted at icloud.com (30-day retention independent of local Trash), Time Machine hourly and daily snapshots to restore any version, Spotlight and Recents in Finder for misplaced files, version history in Pages and Numbers via File Revert To, PhotoRec free open-source recovery (always save to a different drive), stop using the drive immediately to preserve unwritten sectors
Can't log in to Mac: Caps Lock LED check and keyboard layout icon in top-right corner of login screen, password hint question mark after failed attempt, Apple ID password reset from the login screen (appears after three failed attempts), Recovery Mode password reset via resetpassword in Terminal (Command+R on Intel, hold power button on Apple Silicon), FileVault pre-boot screen uses recovery key or Apple ID unlock, disabled account recovery via resetpassword in Recovery Terminal, work and school MDM-managed Macs require IT department for recovery

Linux: System & Network

Linux running slow: htop sorted by CPU% (tracker-miner-fs indexing, kworker signalling hardware issues), free -h for RAM and swap usage, swappiness reduction to 10 via sysctl, CPU governor check (powersave caps CPU speed, switch to performance with cpupower), disable unneeded systemd services, drive health with smartctl and Reallocated_Sector_Ct, dmesg for silent kernel errors (ata soft reset failed, EXT4-fs errors, USB reconnect loops), package and thumbnail cache cleanup
Linux WiFi not working: rfkill list and rfkill unblock wifi for soft and hard blocks, nmcli device status (unmanaged vs unavailable vs disconnected states), nmcli device wifi connect from command line, lshw -C network for UNCLAIMED driver status, Broadcom bcmwl-kernel-source and ubuntu-drivers install, missing firmware packages with linux-firmware and firmware-misc-nonfree (the most commonly skipped fix for chips that load the driver but cannot initialise the radio), DNS fix via nmcli con modify with 1.1.1.1, restart NetworkManager
Linux won't boot: GRUB Advanced options to try previous kernel (broken kernel update is the most common cause), hold Shift or Escape to force GRUB menu on BIOS or UEFI systems, recovery mode root shell with df -h to check for full root partition and apt autoremove, grub-install and update-grub from live USB for grub rescue prompt, remove NVIDIA driver with apt remove --purge nvidia-* in recovery for GPU-related boot failures, fsck -y from live USB for filesystem corruption

Linux: Audio & Graphics

Linux no sound or audio not working: pactl info to identify PulseAudio or PipeWire server, alsamixer to unmute Master and PCM channels showing MM, systemctl --user restart pipewire pipewire-pulse wireplumber for PipeWire or pulseaudio -k for PulseAudio, Settings Sound output device check after HDMI or Bluetooth connection, switch to PipeWire with apt install pipewire pipewire-pulse wireplumber, install linux-firmware and firmware-realtek for missing audio chip firmware
Linux GPU drivers not working: lspci | grep -i vga to identify GPU generation, Ubuntu and Mint Additional Drivers tab for safe NVIDIA installation, nvidia-smi to confirm driver loaded (table with GPU name and version), akmod-nvidia on Fedora with 5-minute wait before reboot for akmods compilation, dmesg | grep -i nvidia for Secure Boot module signing errors, add nvidia-drm.modeset=1 to GRUB_CMDLINE_LINUX_DEFAULT for Wayland support, AMD GPUs from 2012 use built-in amdgpu kernel module with no extra installation

Linux: Hardware

Linux Bluetooth not connecting: sudo systemctl status bluetooth and systemctl enable bluetooth, rfkill list for Soft blocked or Hard blocked state, bluetoothctl for reliable re-pairing (scan on, pair, connect, trust commands), sudo apt install libspa-0.2-bluetooth for headphone A2DP audio on PipeWire, sudo apt install bluetooth bluez to update BlueZ stack, sudo hciconfig hci0 down then up to power-cycle the adapter
Linux printer not working: sudo systemctl status cups and sudo apt install cups, http://localhost:631 CUPS web interface for full printer configuration options, sudo apt install hplip hplip-gui and hp-setup for HP printers, support.brother.com .deb package for Brother printers, add network printer by LPD/LPR IP address in CUPS web interface, sudo tail -50 /var/log/cups/error_log for the exact failure reason, IPP Everywhere driverless option for printers from 2019 onward

Privacy: nothing leaves your device

CalmPC runs entirely in your browser. No data, diagnostics, or personal information is sent to any server. There are no accounts, no cookies for tracking, and no ads. The fix guides are built into the page. They work completely offline once loaded.