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PC won't shut down, keeps restarting

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Following up on the suggestions already posted: and were right to check disk health, and ’s note about the automatic-restart setting is a good quick way to stop reboot loops while you investigate. The next steps are to determine whether Windows is failing to power off (software/driver issue) or actually losing power and restarting (hardware/PSU/BIOS). Use logs and targeted checks to narrow it down. (windowscentral.com)

Open Event Viewer (run eventvwr) and filter the System log for shutdown/restart-related Event IDs (examples: 41, 1074, 6006, 6008). The timestamps and any preceding errors (driver, kernel, or power events) are the best clue to what forced the reboot. If the log shows a crash or a Kernel-Power event, that points toward hardware/power or driver faults; if it shows a clean shutdown followed immediately by a power-on, look at wake sources. (windowscentral.com)

Check device wake sources (modern Windows) and NIC/BIOS wake settings. From an elevated command prompt run: 

powercfg /lastwake
powercfg /waketimers
powercfg /devicequery wake_armed

If a network adapter or USB device is listed, disable its “allow this device to wake the computer” in Device Manager and check the NIC’s Advanced/Power options (Shutdown Wake-on-LAN / Wake from Shutdown). Also check the BIOS/UEFI ACPI and Wake-on-LAN settings. (learn.microsoft.com)

If the problem began after running a system cleaner/defrag (Advanced Windows Care), consider rolling back: boot to Safe Mode and test shutdown, run sfc /scannow to repair system files, and use System Restore to revert to a point before the change (make a backup first). Be cautious with registry/cleanup tools—many vendors and Microsoft advise they can cause instability. If logs show sudden power loss with no software error, test PSU/motherboard or try a minimal hardware configuration. (support.microsoft.com)

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Member Avatar for caperjack

PC won't shut down, keeps restarting

Im sure you could add a bit more info so we can try and help you ,when did it start , how are you shutting it down .with the start /shutdown option or with the Case front power on/off button

Member Avatar for Member #307230

Im sure you could add a bit more info so we can try and help you ,when did it start , how are you shutting it down .with the start /shutdown option or with the Case front power on/off button

Sorry,it all started a few days ago when i installed some program that I allready uninstalled, then I run another program: Advanced Windows care v2 to clean up temp files and defrag my HD, when I try to restart the PC via the normal mode: START-TURN OFF COMPUTER-TURN OFF, it goes into saving your settings and everything but instead of turning off it just reboots again so I have to press and hold the power button to turn it off .

Member Avatar for caperjack

ok ,when in windows go to mycomputer ,right click on the harddrive icon and go to properties/tools ,and run the disk check ,check it off to fix all errors and then reboot computer to run the check

Member Avatar for Jupiter 2

Run
Chkdsk /F C:
It will prompt you with a message Y/N to check drives at next start up "Y"
shutdown becausem as you know, it will restart itself.

At start up a screen appears. Let it run and watch what it does. It takes about 2 minutes.
At desktop, Start > Shutdown .

If the problem is not resolved, I have other solutions (I just haven't thought of them yet!).

Member Avatar for shimari

not the same problem ,in my opinion

If not the same problem, some stunningly parallel characteristics. Under the heading of "Windows XP Shut Down and Automatic Reboot Problems", here is a statement of the problem the Microsoft Help and Support site was addressing:
"I am running Windows XP Professional and it absolutely refuses to shut down. Every time I tell it to shut down it goes through the motions, but when it gets to the point to turn off the machine, the BIOS screen comes up and the machine reboots." That is the problem I was experiencing. (How is that different from this thread?)

The straightforward solution was:

1. Right-click My Computer, and then click Properties.
2. Click the Advanced tab.
3. Under Startup and Recovery, click Settings to open the Startup and Recovery dialog box.
4. Clear the Automatically restart check box, and click OK the necessary number of times.
5. Restart your computer for the settings to take effect. At this point all you have achieved is a clean shutdown, power off, no automatic reboot. Assuming the automatic reboot happened as a result of an error in the shutdown sequence, then you still have a problem, and there could be multiple causes. But that's a different problem. The next step would be to examine the error log an learn what sent the shutdown sequence into a tailspin. Even without disabling the automatic restart, one could look at the error log and deal with the underlying issue. Probably should anyway. But if you really need to get the PC into a POWER OFF state without actually pulling the plug, the above fix should be useful.

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