Hey, Recently I've been trying new things with my gateway desktop. I tried putting in a 8400 gs graphics card in my computer. When I turned it on nothing showed so I took it out. Everything was working fine until I tried taking my old fan out and putting a new one in. I don't know why but still when ever I turn my computer on, my computer runs fine and the fans work fine, but I get no display. Also I don't hear the sound that it's supposed to make when you turn it on. I tried plugging the VGA cord or whatever in the different slots but it doesn't show anything still.