Computer shuts down after initial OS load, turns itself back on and proceeds to load

windows 7 just fine. It doesn't cycle, it just shuts down the one time after POST/Loading OS then after it turns itself back on after a few seconds, it goes into Windows just fine. Seems to be a unique problem as I have yet to find an answer.

This is a newly built computer and everything checks out fine besides this glitch.

Gigabyte GA-P55 USB3 mobo
XFX HD6870 gpu
Intel i5 750 cpu
Antec 650W psu
120gb SSD (primary)
640gb HDD (WD Caviar Black) data drive