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Power supply not responding after install

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I am working on a pc running XP pro that has a bad PS. I took one out of another working pc with same voltage values and installed it. When I plug it in and turn it on, I get not response whatever. I put a multimeter on some of the molex connectors, and no power. The mother board looks ok(no bulges on Capacitors), but the system may have other problems since it has been down several months and I don't know any history. What should I look at next? Thanks in advance.
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Neil Jones

Neil Jones

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Dead board.
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If you want to verify what Neil Jones states, then unplug the power to the MOBO and leave everything else connected to the PSU
Now turn the PSU on.
Does it power up?
If so then Neil has given you correct advice.
I do agree with him as you stated the PSU is a known working unit.
This test will just verify the MOBO is the culprit.
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