try to remove the graphics card and run your computer using the onboard video card
This assumes there is an on-board video card.
Glenn: are you running video from an installed graphics card in a PCI, AGP, or PCI Express slot, or are you running from the on-motherboard video port?
If there is an on-board video port, and you want to try to use it, remember to access your BIOS settings, and enable on-board video.