Computer won't post...this is interesting...think it's the PSU...please read and let me know what you all think

So recently I have had to do a combination of removing my memory and reseating it...but found that the real issue/remedy for why my computer would start but not post was only fixable by shutting the power off and pulling the main power feed to the motherboard out, almost as if I was re-seating it. However, immediately upon a shut down...I'd have to do the same thing even though the computer has not been moved. It's gotten progressively worse...I was just playing SC2 and the computer froze, I had to shut down manually...went to turn back on...nothing. Do you think it's my mobo? PSU? Video Card?

I have a i7 930 on an Asus Rampage III extreme mobo...12 gigs of ddr3 from corsair (also tried older corsair ram that used to run this machine with no luck). The system is watercooled at both the cpu and video card. I removed components, reseated wires at PSU. The odd thing is...the memory comes with a fan of it's own that is plugged into the fan output on the motherboard for the processor itself (to read fan speeds and power the fan)...the system would always turn on...however not post...and when it didn't post, that fan in particular would NOT be working. It's also been randomly shutting off recently and locking up when the temps are under 25c and I'm not running aggressive clocks whatsoever. Has anyone experienced or heard of this happening? I'm really hoping it's a bad PSU...the EVGA GTX680 4gb is not cheap and since it's water cooled I'm pretty sure my warranty is over with on that component.

thanks for your time and input

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  1. Mike sounds like the power good line on your power supply is weak or failing. Looks like a cap issue in the power supply forcing you to drain power from the ps or mb.
  2. The fan is the give away, try another psu.
  3. Always good to have a cheap PSU tester. Don't need one with a digital LCD, but they are very handy in verifying voltages. They're still pretty cheap. You can also remove the PSU from the system, and short the green wire to any black wire and use a meter to test the voltages on the PSU.

    Overall, it sounds like a bad or failing PSU.
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