I have a Nvidia GeForce 6800 that I've stuck into my Dell Inspiron 530 MT. If I plug the monitor cable directly into the card before turning my computer on, I have large white lines going across the screen all through the boot process, and once Windows actually loads, the screen just turns black. Does anyone know what the issue is? I have the drivers installed. Also, when I check the device manager, it says the only thing installed is a G33 family chipset.