Reboots, then Stable for Hours

I was looking through the forum and troubleshooting thread for a similar situation, but I didn't run across one (please excuse me if I missed it). Over the weekend, I built a new pc. Here's what I used:

- Core i7-2600k CPU
- ASUS P8P68-V Pro
- 4x2 DDR3 Corsair Vengence
- MSI GTX 560ti
- 1TB Segate SATA 6.0 Hard Drive
- 160GB Maxtor SATA 3.0 Hard Drive
- Samsung DVD-RW
- ASUS Xonar DS
- Noctua 6 pipe cpu cooler
- Corsair TX 750W power supply
- Thermaltake v9 Blacx Edition
- Windows 7

When I first turn my new computer on, it goes through the POST lights on the mobo, doesn't make any speaker sounds, then turns off. Without me touching it, about 5-10 seconds later, it will restart and do the same thing. After anywhere from 2-5 times of doing this, it will start up without a hitch.

Once it starts up fully, it's rock solid. I can play games for hours without any problems.

Can anyone suggest where I should start troubleshooting?

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More about reboots stable hours
  1. return the board for another, problematic board
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