Computer won't power up with ATX12V connected

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Katla

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Dec 20, 2003
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About a week ago I was on my system (stable desktop unit, unchanged for a few years), browsing the web, when it suddenly died. Kaput. Would not power back on. I smelled nothing - either signs of a blown PSU or motherboard, but I nevertheless went out and bought a new PSU. I'd been using a 500w for a few years, upgraded to a 600. Installed it, plugged everything back in. Nothing. Started stripping things down, trying to isolate the issue. Discovered that if I leave the ATX12V pins unplugged the computer powers on fine. At least as fine as it can (fans, lights, etc). I can see zero signs of damage to not only the ATX12V, but to the mobo as a whole. Have seen other threads online about this issue but nothing that was resolved. Just a lot of stumped people and guesses.

I'm already out the money for a new PSU (good to have a back-up, I guess), so before I start buying motherboards or a CPU I'd like to try to get some inkling of what I'm looking for. I've got a friend's old motherboard with me, and tomorrow I hope to try that out. Problem is he has no processor (or heat sink) on that so I'd need to use mine and get a new sink.

Any advice on what to look out for while doing all this would be appreciated, as would any clues on this issue as a whole. I'll keep this thread updated as I test things out.

Thank you.
 
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