My computer runs fine when it is turned on, but it has recently been crashing after ~45min to an hour of being turned on. After the crash you cannot turn it back on again unless you unplug the power cord from the psu and plug it back in (even so after it has been turned off and unplugged from the wall for several hours. I don't think the OS matters for the problem, but in case it does I have winXP Home. All help is welcomed, Thanks in advance, Arthur

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This is the Vista forum (!) but as you say I don't think it matters. Almost certainly 
you have an overheating CPU.

Check the airways are unobstructed (by a wall next to the system box for instance) 
clear and dust free, that the fans are working, and that the CPU is properly seated 
on to its heat sink.

Then off to a hardware forum, technical friend or repair shop.

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Or, a power supply unit (PSU) that is overheating.  Martin's point might be valid, 
too. Check to make sure all fans are working and nothing is obstructed with dust, 
wires, mice nests, etc.  :)

If you have access to another PSU, try switching it out and see what happens. Otherwise, 
yes, it might be time for the repair shop.

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Power supply is more likely. Specifically the MOV's that prevent overloading. If nothing else fixes it, find, beg, borrow another supply from the kid next door that has more used parts than he has sense and see if that does the trick.

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