Computer doesn't recognize correct graphics card

Recently swapped out my CPU cooler in which I had to take a few things apart. Now my computer thinks I have a radeon 4250 card when I actually have a 6950. I tried the driver installation CD but that didn't work. Any other ideas?

Also, might be related, I get a message before starting Windows saying "Scanning devices...no devices"

Im gonna assume the 4250 is integrated and you accidentally plugged the monitor cable to the motherboard instead of GPU.

Just swap it.

Im gonna assume the 4250 is integrated and you accidentally plugged the monitor cable to the motherboard instead of GPU.

Just swap it.

GTR12