There are several possible problems that can’t be directly pinpointed. The most likely causes are resource conflicts or wrong configuration settings. If you recently upgraded or added a component to your system, check that first. Verify everything is installed correctly; that jumpers, if any, are configured properly, and then read on.
Cause 1: If the video card was recently added, it could be a problem with the fixing.
Solution 1: Ensure that the card is seated tightly, firmly and completely in its slot. Power off, remove the card, reseat it properly, and then reboot.
Cause 2: If you have an older card, the chips on the card itself may have come loose.
Solution 2: Carefully press the chips back in. Take care not to touch any exposed circuitry. Moreover, don’t pile on the pressure! A firm but gentle push should push the chips back in.
Cause 3: There maybe a resource conflict with another device using the same IRQ. PCI video cards generally use IRQs 9, 10, 11 or 12.
Solution 3: Remove the video card and reboot. Open Device Manager and verify that at least one of these IRQs are available. Check the video card manual for any jumper settings you need to set to match the IRQ settings of your system.
Cause 4: If the motherboard has an onboard graphics adapter, the video card may be conflicting with the adapter, and neither will work.
Solution 4: Disable the onboard video adapter in the BIOS or through a jumper setting on the motherboard.
Cause 5: The video card is bad.
Solution 5: If you have a similar video card, test the second one on your system. If the second video card works, then you can conclude that your original card is bad. Test your video card on another system. If your card works on the other system then the video card is good and the problem is most likely a resource conflict. In rare cases, it could mean that your video card is not compatible with your PC.
Cause 6: If you just added memory to your video card, this could point to memory incompatibility or faulty insertion.
Solution 6: Remove the memory module and reinsert it properly. Verify you have the correct memory for the card. The memory should be identical to what already exists.
Cause 7: Video BIOS Shadowing may be conflicting with the graphics card.
Solution 7: Disable Video BIOS Shadowing from the BIOS.