PC restarting on shutdown

[js493cam]

Hi,

My PC's shutting down just fine but as soon as the power gets cut, it
comes straight back on again. I now have to wait at the mains power
supply for it to shut down and turn it off manually before it restarts.
I replaced the PSU and it worked for a bit, but now it's doing the same
thing. Any ideas anyone?

Thanks

 

[Detlev Dreyer]

My PC's shutting down just fine but as soon as the power gets cut, it
comes straight back on again.

If the power gets cut, Windows is not running and cannot restart the
computer (cold reboot). Therefore, this is a hardware/firmware issue
most likely. Just in case that there is a "warm reboot" instead, see
if this article applies: "Windows XP restarts unexpectedly or restarts
when you shut down the computer"
http://support.microsoft.com/?kbid=320299

I now have to wait at the mains power supply for it to shut down and
turn it off manually before it restarts. I replaced the PSU and it
worked for a bit, but now it's doing the same thing. Any ideas anyone?

Enter the BIOS setup and check if any "Wake-up on..." events have been
enabled. If this is not the case, take the computer to a technician.