Windows 10: PC Turns Back On After Shutdown — Only Fully Powers Off with PSU Switch or Holding Power Button

Hey everyone,I’m running into a frustrating issue with my PC and would really appreciate some help.Whenever I shut down my PC Windows, it powers off briefly and then turns itself back on after a few seconds. The only way to completely shut it down is either:Flipping the PSU switchHolding the power button down for a hard shutoffWhat I’ve Tried So Far: Wake on LAN and Wake on USB are disabled in BIOSI cannot find "Fast Startup" in Power Options, but I believe it’s already disabledRemoved the LAN cable — issue persistsUnplugged the power switch cable from the motherboard — no changeChecked the

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PC doesn't power down after holding power button for 4 seconds

The power button on a PC is temporary push switch. It makes contact as long as you hold the button down. Quick press and release triggers a smart relay on the MB to turn on or off, depending on default or OS state, such as cold on, sleep on, turn off, sleep off, etc. Holding the button down for a long time is a default hardware power kill switch. If it's not working, suspect the MB. Reset the BIOS is a good suggestion, but prolly won't work.

 

PSU or Power Button fault?

Thanks for the reply. I was able to take a power button switch with its cord from another older pc, and it works perfectly. So it must be the power button/cord.

The only problem is that this power button switch is too small to fit in the hole of the previous switch. So when I press the button of the chassis from the outside, it pushes the whole button out instead of merely pushing the switch in. I'm not sure if I can find any that would perfectly fit in my chassis.

 

PC doesn't power down after holding power button for 4 seconds

Although not very likely, it is just possible that the switch is intermittent, so it could contact momentarily when held in to trigger a normal Windows shutdown, but then not maintain that connection solidly for the whole 4 seconds. This is why I suggested touching the contacts with a screwdriver, to rule out this possibility.

Also, afaik the 4 second off is not controlled by the BIOS, the PC switches off no matter what. That BIOS power configuration refers only to momentary presses.