A PC that restarts by itself is often hiding the real error. The screen may go black, fans may stop and start again, and Windows loads as if nothing happened. Common causes include crash settings, overheating, loose hardware, bad drivers, memory problems, or unstable power.
These steps apply to Windows 10 and Windows 11 desktops and laptops.
Does This Affect You?
Use this if the computer reboots without warning, either randomly or under load, instead of staying on.
Turn Off Automatic Restart
- Open Settings > System > About.
- Open Advanced system settings.
- Under Startup and Recovery, click Settings.
- Uncheck Automatically restart.
- The next crash should show a blue screen stop code instead of instantly rebooting. Write it down.
- Open Event Viewer > Windows Logs > System and check errors around the restart time. Kernel-Power 41 often means unexpected power loss.
Rule Out Overheating
- Clear intake and exhaust vents.
- Avoid closed cabinets and blocked laptop vents.
- Feel for very hot exhaust during load.
- Use HWiNFO or HWMonitor to watch CPU and GPU temperatures.
- Sustained CPU temperatures around 90 C or GPU temperatures around 85 C can trigger protective shutdowns.
- If temperatures are high, clean dust and check cooling before replacing parts.
Reseat RAM and Power Connections
For desktop PCs, shut down, unplug from the wall, ground yourself, and handle RAM or cards by the edges only.
- Open the side panel.
- Release and reseat the RAM sticks until both clips close.
- Press the 24-pin motherboard power connector firmly into place.
- Check the 4-pin or 8-pin CPU power connector near the processor.
- Check PCIe power cables on the graphics card.
- Close the case and test for a day or two.
Deeper Causes
- A weak or undersized power supply can restart under load, especially after adding a GPU, drives, or lighting.
- If restarts began after a Windows or graphics driver update, roll back the driver or uninstall the recent update.
- Run Windows Memory Diagnostic or MemTest86 if Event Viewer shows memory-related errors.
- Consistent memory errors usually mean a RAM stick needs replacement.
Sources
- Microsoft Support: Troubleshoot blue screen errors
- Microsoft Support: Fix power problems in Windows
- Crucial: Diagnosing a computer that randomly restarts
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