I had that happen. I never did figure out what the problem was.
Sometimes it would fix it's self after i went in there and started unplugging stuff trying to find what the problem was.
Either way i tried 3 power supplies (from working computers), 3 new motherboards and 1 new case.
It would always work after I replaced something, but only for a few months (or weeks in some cases).
I just gave up on it. It's cursed or something.
I did find and artical about it (I lost it though). It just said check the power supply (try one from a working computer), try and start it with out the power switch (touch a paper clip to the to pins the power switch would normaly go over) and if it's not those it's the motherboard and it needs to be replaced.
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