When I install a GeForce 7950 GX2 graphics card, my system boots but my display is blank
The GeForce 7950 GX2 graphics card utilizes two graphics processors (GPUs) to deliver very high graphics performance. When your computer boots up, it is normal for only one of the GPUs (the primary GPU) to send an image to your computer monitor.
If your motherboard only recognizes one GPU on the GeForce 7950 GX2 graphics card, or if it incorrectly enumerates which GPU is the primary GPU and which is the secondary GPU, your computer will seem to boot-up properly but there will be no image on your monitor's screen.
NVIDIA recommends you take the following steps to address this problem:
1. Check with your PC or motherboard manufacturer to determine whether the PC or motherboard has been tested with the GeForce 7950 GX2 card. Alternatively, check here to see a list of motherboards which NVIDIA has tested.
2. Your motherboard may require a BIOS update to be compatible with GeForce 7950 GX2 graphics cards. Follow the manufacturer's instructions to update the system BIOS on your PC or motherboard to the latest revision.