Alright, I'm trying to fix this for a client and it's making me feel very dumb. After Windows starts and before the login screen, the display goes blank. If I boot into Safe mode everything's fine. GOT to be the video card/drivers right? Well.. I used 3 different video cards each in 3 different PCI-E slots. The BIOS's video setting is to PCI-E. I slicked the hard drive and reinstalled Windows. Same results. I'm hoping I'm stupid and am overlooking something obvious. Any ideas? I also tried swapping out the PSU with a brand new, higher wattage power supply.