Powering down

So I built my first full build about a month ago, everything is perfect and running great except one thing. When I power my PC on, the system starts up as normal and everything is fine until it powers itself back off for about 3 seconds and then turns itself back on then goes on as normal and starts up as if nothing happened. This happens every single time I turn my PC on from being completely shut down. I've actually seen it one time go On>Off>On>Off>On before. No error messages pop up anywhere. I can go into my components if it helps, although I hope it's an easy fix.

[edit] It powers itself down 3 seconds after pushing my power button
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  1. Best answer
    From your description I'm assuming you have a Sandy Bridge system.

    This is a common problem, and the only consistent fix is a BIOS update for the mainboard. Check to see whether you have the newest BIOS version -- if you do, then you'll have to wait for a newer one. If you don't have the newest one, then update it and see if that fixes the problem.
  2. Thank you! I will definitely try that. And yes, sandy bridge.
  3. Alright, I updated my BIOS to the latest beta version, and it still happens. I think I'm just going to have to wait for the newest one that must not be released yet.
  4. Best answer selected by smoketrio.
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