I just built a new rig, an asus p7p55d with an 870 I-7. 2 sticks of G.SKILL Ripjaws Series 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 and a GTX470. Im using an OCZ600sxs for my psu. The problem is when I turn it on, it does an infinite loop of starting for half a second and stopping. I know a lot of people have had the same problem with this mobo and I would instantly think that was the problem but for some reason sometimes I CAN get into windows with a lot of luck. It runs just fine when I can actually get it booted up, had it running for a couple days straight with no incident, which makes me the think the PSU is not the problem. As soon as I turn it off though I cant restart it. If I unplug the two power pins to the CPU the computer boots right up and stays on, but with them plugged in it does the loop. Im not sure if I should RMA the mobo or upgrade my PSU, I dont think it would run for 2 days straight like that if it were the PSU though.