I just added memory to a Dell Inspiron 620 and am having weird results in regards to the video card. I have a GT 430 in there. When the video card is removed, the computer displays normally through the onboard HDMI port. But when I add the video card into the mix, the bios screen shows, and the loading screen for the Windows OS shows. After that it's still black. My display is getting a video signal because it doesn't go to sleep. The computer is clearly running normally aside from the video. It's CPU is running, there is HDD activity, and I can access files over the LAN. Any thoughts? I have the latest BIOS and drivers on it.