If your Windows 11 PC keeps restarting without warning, the cause may be an automatic restart after a system error, a driver problem, overheating, or a power issue. Work through these checks in order and save important files whenever the computer stays on long enough.

1. Check whether Windows is reporting a stop error

If a blue screen appears briefly, Windows may restart before you can read it. Open Settings → System → About → Advanced system settings. Under Startup and Recovery, choose Settings and temporarily clear Automatically restart. If a stop code appears next time, write it down; it can help identify the failing driver or component. Turn the option back on after troubleshooting if you prefer.

2. Review Reliability Monitor

Search Windows for View reliability history. Look for red critical-event markers around the time of each restart. Open the entries and note whether they mention a Windows failure, hardware error, or a particular application. Repeated identical events are more useful than unrelated warnings.

3. Install appropriate updates

Go to Settings → Windows Update and install available updates, then restart normally. Also check the computer manufacturer’s support page for your exact model for chipset, storage, and graphics drivers. Avoid third-party driver updater utilities.

4. Check temperature and power

Make sure the vents are clear and fans can move air. On a desktop, check that power cables are firmly connected; on a laptop, test with its correct charger. If restarts happen during demanding games or workloads, heat or unstable power may be involved. Stop using the machine if you notice a burning smell, unusual electrical sounds, or a swollen battery.

5. Repair Windows system files

Open Terminal or Command Prompt as administrator and run DISM /Online /Cleanup-Image /RestoreHealth. When it finishes, run sfc /scannow. Restart after both commands complete and note any repair messages.

6. Undo recent changes

If the restarts began after installing hardware, software, or a driver, disconnect newly added peripherals and uninstall or roll back the recent change where appropriate. If Windows cannot stay running, use Windows Recovery Environment and its Startup Settings or System Restore options.

When to seek help

If the computer continues restarting before Windows loads, or hardware errors appear repeatedly, back up accessible data and contact the device manufacturer or a qualified technician.

Bottom line: Capture any stop code, inspect Reliability Monitor, update model-specific drivers, and check heat and power before making major changes.

If Windows 11 stays on the Restarting screen for an unusually long time, an update, an unresponsive app, a driver, or damaged system files may be involved. Give the computer a little time first, especially if it is installing updates. If there is no progress, work through these checks carefully.

1. Wait and check for update activity

When Windows is applying updates, the screen may remain unchanged for a while. Keep the PC connected to power and avoid interrupting an update that is visibly progressing. If the screen has not changed for a very long time and the device appears completely unresponsive, a forced shutdown may be necessary, but use it only as a last resort because interrupting updates can cause startup problems.

2. Disconnect unnecessary devices

Unplug external drives, USB hubs, controllers, printers, and other nonessential accessories. Leave the keyboard, mouse, display, and power connected. A peripheral or its driver can sometimes interfere with shutdown or startup. Restart and see whether the behavior changes.

3. Try a normal shutdown from Windows

If you can return to the desktop, save your work and close applications. Open Start, select Power, and choose Shut down. An application waiting for a response can delay a restart, so check for unsaved documents or prompts before closing anything.

4. Review recent updates and drivers

Consider whether the issue began after a recent Windows update, driver installation, or new utility. Open Settings → Windows Update → Update history to review recent changes. If the timing clearly matches a driver update, use Device Manager’s supported Roll Back Driver option when available. Avoid removing several updates or drivers at once.

5. Repair Windows system files

If Windows starts normally, open Terminal as administrator and run:

sfc /scannow

Allow the scan to finish and follow its result. If it reports that some files could not be repaired, use Microsoft’s supported DISM repair procedure before running the scan again.

6. Check startup applications

Press Ctrl + Shift + Esc to open Task Manager, then select Startup apps. Temporarily disable nonessential third-party applications that you recognize, especially ones recently installed. Do not disable security software or unfamiliar system components without understanding their role. Test restarting again.

7. Use Windows Recovery if it will not restart

If Windows cannot complete startup, enter the Windows Recovery Environment and try Troubleshoot → Advanced options → Startup Repair. If the issue began after an update, the recovery options may also offer an uninstall-update path. Follow the prompts and keep the device connected to power.

When to seek more help

If the PC repeatedly freezes during startup, shows a blue-screen code, or fails even in recovery, note the exact message and consider professional diagnosis. Back up important files whenever you regain access.

Bottom line: First allow updates time to finish, then test with peripherals disconnected, review recent software changes, and repair system files. Avoid repeatedly forcing power off unless the system is genuinely stuck.