I just bought the Z68 Pro3 and I've never had this issue before. I've tried updating to the latest bios on ASRock's website, cleared the CMOS, reseated everything, etc. The on-board video works just fine but when I boot up with my DVI in a discrete card it just shows a black screen. I tried emailing Emily but it said her inbox was full. Anyone have any ideas or should I just send it back for a new one? Thanks!