Hi there, I've recently upgraded from a GTX 770 to a 1070 so I decided to replace the GTX 480 (works fine btw) in another computer with the 770. As far as I could tell, the PC was booting up but there was just nothing being displayed. I plugged in a second GPU just so I could see what was going on (8400gs) and the 770 just doesn't show up in device manager. The computer in question is a Dell XPS 710: QX6700 @ 3.2Ghz 4GB DDR2 RAM 750W PSU I think the PCI-e slots are v1. Chip set is NVIDIA nForce 4, SB: nForce 570 SLI. I'm absolutely stumped by this so I'm hoping someone might be able to shed some light, thanks for your time.