Computer restarts upon booting, then works fine

Recently built a new computer after finally getting a working power supply. But there is a slight problem. After i turn the computer on it lights up for 3 seconds or so then shuts off for another 3 seconds, then it turns back on a boots up perfectly fine and then continues working perfectly. I was wondering what could be causing the restart after everytime i turn it on and is it bad for the computer if this goes unfixed (the restarting after boot up). Or is this just some annoying little bug that i shouldnt worry too much about. Thanks
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  1. It is not bad for it but I wonder if it is something in your BIOS settings.
  2. Odd! I am having the EXACT same problem!
    I've reset my BIOS to default, it still does it.

    Asus P8P67 Deluxe
    SB 2500K
    Corsair 850W
    2x 4G Vengeance
    evga 470
  3. anther ideas? Im using:
    intel core i5-750
    corsair 750 tx 750 w psu
    EVGA p55 motherboard
    4x2gb gskill memory
    MSI gtx460 graphics card
  4. Exact same problem here. Any ideas on what it might be?

    Asus P8P67 Deluxe
    SB 2500K
    Corsair GS 800W
    2x 4G Vengeance
    evga GTX 570
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