I just recently bought a bunch of new parts for a PC i just built. Everything is plugged in correctly and compatable, but when it starts up my computer monitor doesn't get a signal from the the video card, it just stays on stand-by. It's a 9800 GT on an Asus MB and it's getting plenty of power, so i'm thinking the PCI Express slots are not working. I also tried putting my old 6800 GT in and got the same problem. I would appreciate any help, thank you!