My compuer reboots when I turn off/disconnect monitor

Question

Whenever I turn off or disconnect my monitor the computer reboots. This is happening on all my win11 boxes regardless of the make or monitor. The first time it happened was when I used the KVM switch. I then disconnected the KVM let it reboot then just turned off the monitor and it again rebooted. I then just unplugged the HDMI and again it rebooted. I also tried another win 11 box and it did the same thing. I also tried the VGA plug and again it rebooted. If plug a dummy plug into my 2nd HDMI and turn off the monitor it does not reboot. I've turned off auto reboot, BSOD, and that did not fix this problem. Initially when I installed win11 this was not an issue. It started a month ago. I do not recall any changed being made at that time. I've turned off all power/screen saving/sleep options. I never had this problem with older win versions. I have a AMD Ryzen 5 5600X 6-Core Processor , win11 23h2, Radeon RX560 graphics card with updated drivers. The other computer is a radeom A300M. with a generic hdmi monitor

Answer 1

Hello

Since this issue seems to be occurring across multiple Win11 boxes and monitors, it's likely a systemic problem rather than something specific to a particular hardware configuration.

 

Check Event Viewer: In some cases, the Event Viewer can provide more information about the cause of the reboot. Look for any ‘error’ level events that occur right before each reboot.

 

Update BIOS: Ensure that your BIOS is up-to-date. Sometimes, outdated BIOS can cause compatibility issues with the operating system.

 

Disable Fast Startup: Fast Startup is a feature in Windows 11 that can sometimes cause issues. Try disabling it to see if the problem persists.

 

Reset BIOS Settings: Resetting your BIOS settings to their default state can sometimes resolve issues. Make sure to turn off all overclocking settings.

 

Update Display Adapter Driver: A corrupt display adapter driver can cause this issue. Try updating your graphics card driver or reinstalling it.

 

Registry Edit: There’s a registry key called UseIViewHelper in HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\TMM. Try changing its value back to 1.