Quote:
Originally Posted by tbomachines
Either power supply or Motherboard, more likely the former than the latter. I had this exact same thing happen with an old eMachines unit I got for free. As Lutz mentioned, manufacturers cut costs wherever possible and power supplies are one of the first on the chopping block.
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I actually would not think it would be the power supply, usually the power supply is an either dead or alive thing. Since it comes on for a moment, I suspect the switch. If it has any contact problems at all and is passing current even for a millionth of a second beyond the let-go point in the moment switch, it will make his PC do exactly as he described. I'd just get a push button moment switch at Radio Shack and jumper it in place of the onboard one to test it. If it comes on, either use the RShack switch or use it until the computer can be swapped into a new case.
A bad power supply is usually the result of poor fan maintenance, the thing just finally cooks and dies, or bad solder joints from the original build, again something that just makes it fail.