Hmmmm thats strange... to my knowledge the registry entries used to boot windows after a reboot/shutdown are identical so it shouldn't be an application startup causing the problem. For the sake of it I would recommend checking to see whether booting in safe mode works, if it does you can conclude its a driver/software related error.
If not the fact that you have to manually turn the power supply off implies that it might have something to do with voltage/current discharge and problems on the hardware level. As to what component might be causing it, I would have no idea. Maybe try running memtest to make sure that ur ram is okay? Although if it were a ram problem you would expect a BSOD/random crashes and not systematic behaviour like you described...
Could always just try reinstalling windows too, thats always heaps of fun :D
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