Computer shuts down after stuck key caused multiple reboots

So I get home and turn on my computer and leave for about 20 mins. When I return I see that the computer is constantly rebooting, just about getting to bios before restarting (a flash, not full bios load screen). Well I had placed my headphones on the keyboard after shutting down the night before and it was pressing on a couple of keys (which I am guessing caused the reboots).

I turned off PSU, gave it a little time and screen but it sounded as if it started up fine.

I connect my monitor to the MB video card and get a screen.

Device manager indicates that my video card (GTX 560) does not have enough resources. I uninstall and reinstall the video card and after a bit of fiddling/restarts all seems well...except...

Now the computer shuts down as if you pull the power (MB power light on fans running) 20 to 60 minutes from startup.

I have a IR temp gun and the temperature is not overly hot and I do not believe overheating is the issue.

I really hope its just a bios issue rather than something hardware related but I'm not sure what to look for in bios that would cause the computer to just shut down. I have to turn the power off to restart the computer.

A completely separate HD does the same so its not the drive.

I was thinking of just pulling the MB battery and maybe grabbing a PSU to check that. Is there anything else obvious that I'm missing?

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