I'm having the same problem, I turn it on it stays on for like 5-10 seconds, getting no display from any of my graphics cards. Then it shuts off, and try's rebooting. My gpus are EVGA SC GTX 770's in SLi and their fans come on and everything. I reseated both of them, tried only running 1, switched slots. Removed both and tried running on integrated graphics from motherboard nothing. I did the bio's jump, popped the bios battery. Nothing. My Cpu is Liquid cooled, and it's not overheating. My powersupply is a Azza 800watt 80 plus, but i also tried with my spare EVGA 850 Supernova. Both power supply seem to power the system but it still shuts off and restarts. Iv'e come to the conlclusion that its the motherboard. Ive also reseated ram, wires, opticals, hd's. Ran on minimum. So if you've done all that too, Seems like we are both out Mobos. I run ASrock z97 Extreme3, Cpu i7-4770k @4.0gz, dual SLI GTX acx 770s.