Power supplies, bad switches, loose cables, overheating (fan issues), a failing motherboard, bad RAM, just about any number of hardware issues could cause a PC to shutdown. If you don't know how to troubleshoot PC hardware, take it to someone who does. On the other hand, a software or driver error that drastic usually results in an error code, or a blue screen (BSOD). You do know how to set your computer to freeze on a BSOD (with the error code), and not automatically restart, right? > h
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