I built a new PC for my Wife. It is mainly a DFI LANParty SLI-DR board with an AMD Athlon 64 CPU, 2 GB Corsair XMS RAM and 250 GB HDD. The PSU is an Ultra 550 X-connect 2 and the GPUs are both PNY GeForce 6800 GS PCIe. The PC runs fine except when I attempt to enable SLI mode via the nVidia console. The screen goes black except for a flashing white cursor in the top left corner. The LCD is a ViewSonic and it is connected to the top GPU via a DVI cable. I have the mboard jumpers set for SLI, both cards seated properly and all 3 power connecters (1 per GPU & 1 mboard) connected. Any advice is appreciated!!! I have also attempted to reinstall Windows XP and have ensured I am running the same drivers on both GPUs.