Too late for the original poster, but may help others. The Asus Sabertooth 990fx revision one boards came out before the Bios was made compatible with the Bulldozer CUPs. For this reason they will not post, and from the author's original post I can tell that was the situation he was in. The cpu light will flick on once, as the board initiates it's original boot test. It then stops everything, and nothing can advance. The new revision two boards don't have this problem, as the bios is already compatible with the fx cpus. You can identify the revision of your motherboard by looking at the name near the PCI slot. It will say if it is a revision one or two board. Solution... - Remove your fx processor, and place in an older cpu that is compatible with the motherboard. (Or take it back to the store and have them do it.) The motherboard will post with a different cpu. Download the latest non-beta bios from Asus and update the bios. I chose to flash my bios, but you can use the Asus utilities to update it if you prefer.