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PSU powers on computer, then computer starts to lose power

Corsair 650W PSU problem. 790i mobo powers on with a passing boot code but no output from display or peripherals. After a few minutes, total computer power dwindles and can notice loss of power from motherboard. After disconnecting PSU from computer, I connected it to power outlet and turned it on and it emits a strange "fly-like" noise and fan runs for a brief moment. Tried PSU in another computer and problem persists. The major thing I notice is as soon as I flip the power switch on the back of the PSU, it seems shorted to power on state because computer automatically powers on without power on command from front hub of computer case.

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  • djarmag Apr 24, 2009

    I figured it was the PSU because it wasn't powering up my older desktop. I was just wondering if this problem "sounded" like a PSU because I'm used to hearing CPU not powering up, etc. but this is powering up just not booting. But then after a few minutes it starts dieing. Do you think this would kill my mobo or HD? Thanks for everyones help btw.

  • Dick
    Dick May 11, 2010

    There isn't anything you as an end user can do to repair the power supply. Replacement is your best option. What are you asking?

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  • 107 Answers

I agree with ****. You have to replace new PSU .

Posted on Apr 23, 2009

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CHA_FAN1
CHA_FAN2
CHA_FAN3
CHA_FAN4
You're motherboard will supply the needed power. Less wiring will also allow better air flow through out the system and less strain to the fan controllers.
4-pin molex to 3-pin female; http://www.avadirect.com/product_details_parts.asp?PRID=11410
OR
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Happy New Year!
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