Originally Posted by
SkOrPn
That sounds exactly like a video card problem. I had the EXACT same thing happen to me and I regrettably blamed the motherboard and it turned out to be a video card about to die. A few weeks later my ATI 4870X2 died, and I had RMA'd the motherboard thinking it was my PCI-e slots, lol. Amazingly, I tried another PCI-e vid card and still did not have video during bios post but did when I got to windows, but when I installed a OLD PCI card I had bios screen video, so I figured my 4870x2 was good and my pci-e slots up and died. Thank heavens Asus did not question me and properly RMA'd my mobo (its good to own ROG mobos), but when I got the replacement I was embarrassed to find the same exact problem still existed.
A few weeks later the 4870X2 just up and died completely, just turned off in the middle of browsing the Internet and never powered back on again. to this day I still have no explanation as to why my spare video card did not work on the PCI-e slot either, but because of that I was steered in the wrong direction. Thankfully Asus replaced my 4870X2 with a brand new in retail box 5870, lol.
Works for me...