I just uninstalled my 8600gts, and installed a 2900xt that I just purchased from a TPU member. After uninstalling the drivers, I rebooted windows and ran driver cleaner. I then shut down the system. I installed the 2900xt, double checking it was well seated and plugged in both pci-e connectors. I started up the system. I got through the bios flash screen, then the screen goes blank. I tried again, same thing...no dice. I then installed the 8600gts, and everything fired up just fine. What's up with this? I don't think the cards bad, as it was purchased from a reputable tpu member, and he verified it was running prior to shipping it to me. One thing I do notice. When I'm running the 8600gts, even before the bios splash screen comes up, I get a screen that recognizes the 8600gts, and counts the memory. I did NOT receive the same screen with the 2900xt...whats up with this. Please help guys!!