I have been running this mobo for 2 years without any trouble, and was somewhat enthused about putting in a shiny new 8800GT. However, after successfully installing the card, my computer will no longer boot up. The fans will begin to spin, the hard drive activates, and everything seems normal... for roughly one second. Then the system shuts down, pauses for a few seconds, and then begins this cycle again. The monitor never gets a signal, there are no beeps... I have checked the cables from the hard drive, psu, and just about everything else I can think of. I have tried putting in my old card, but that doesn't seem to help, so I can only conclude that something went wrong during installation. Any ideas?