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Repeated power failure

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by tmalo627

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I am working on a Dell Dimension 2350 with a recently replaced hard drive for a friend of mine. The problem I am having is that it reapeatedly shuts off 5-10 minutes after being powered on. It will shut off whether I boot into Windows or into BIOS or even if I attempt a fresh install of Windows before it gets to the GUI phase. I have pulled out and tested the power supply, and the hard drive. Both work fine in another test machine that I have. I have tried replacing the system battery, but no luck. If anyone knows of anything else I could try, it would be appreciated. If all else, I'm at the point where I'm thinking the motherboard is the problem.

Thanks alot

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by rob miners

A common reason for shutting down and locking up or freezing is the CPU overheating.

Faulty Fans, Dust and Grime build up on the Heatsink restricting air flow. I would give the inside of the case a blowout with compressed air. When blowing air through the fans make sure that you physically stop them from spinning, as they may generate power and blow something up. Then remove the Heatsink, giving it a thorough clean and reseat the CPU applying new CPU grease. If the Fans spin freely when you give them a spin they are probably OK. If there is resistance replace them.

Also check Capacitors around the CPU for swelling or bulging.

A faulty PSU can also cause it. Fluctuating power is no good for the motherboard. Try another one if available or replace it.

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