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wippel

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PC Shuts Down Abruptly

My PC just shuts down abruptly. No event in the viewer. Need to unplug power supply, wait about 15 seconds and plug it back in to get it to start up again. It runs again for anywhere from 5 minutes to a couple of hours before shutting itself down.
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Callandor
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wippel

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The computer is several years old and is an HP. I suspect it's getting the theoretically correct power. I'll try the a different power supply.
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How would I tell if the CPU or Video card was overheating?
Install a monitoring tool like Everest: http://www.majorgeeks.com/download4181.html

You can also physically open the case and touch the heatsinks.  If they are too hot to keep your fingers on them, the chip they are on is too hot.  You can blow out the dust in the case and make sure there is good ventilation in the case to fix this.
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Your CPU fan may also be failing or not working at all.
AB
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Also, check to see that the power supply fan is still working.
It looks like just about everyone (except me) provided valid info so you should split the points between them.