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Unusual Power Supply Failures

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A guy at work asked me to stop by and take a look at his computer the other day. He told me that I wouldn't power on following a power outage at his house. I plugged in the machine, pressed the button and the fans spun for a split second and then shut off. I grabbed my power supply tester and checked every cable. According to the tester, everything was fine, but I'm assuming that's because the tester doesn't apply a load.

Anyway, I started unplugging things one at a time until I got the the 4 pin power connector for the processor. Once this was unplugged, the machine would stay on with no problems. I told him that it looked like a problem with the power supply, so we ran to Best Buy and grabbed on off the shelf. Hooked it up and it had no problems.

Fast forward about 2 weeks. He told me this morning, that the same thing is happening again. Try to turn it on and the fans spin for a second and the machine turns off. Anyone have any idea as to what the problem might be? The machine functions flawlessly other than this unusual problem.
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