Graphics Card Not Working (But Being Detected)

[DanteChiesa]

GTX 660
Hello, recently I have dropped my computer a considerable distance off my desk, and now I have a weird problem with the graphics card.
When I restarted my computer, everything seemed to work completely fine, I opened my computer up and there was no damage whatsoever, however, when I played a video game and the graphics were considerably down, I checked DxDiag and no graphics card was being used besides the built in one.
I decided to reinstall the graphics card drivers, and it was able to detect what graphics card I have , also, when I took the graphics card out, Nvidia detected there was no longer a graphics card being used. (aside from the error it gave me when trying to install updates-- "Cannot connect to nvidia")
The graphics card is not broken as I gave it to a friend and he said it worked fine in his computer.
I'm starting to wonder if its the mother board, but if that was the case would it not be undetectable?
Is there any advice for something that I can do fix this?
Thanks a lot, Dante

 

[DrizzyFrizzy]

It may be your motherboard. Your motherboard is quite important to the graphics card, processor, etc.. is the motherboard perhaps broken? Try opening up your computer and see if your motherboard is damaged or reinstall motherboard drivers.

 

[CODE B BLACK]

Try installing windows 10 then updating the driver for the Graphics Adapter after installing windows 10! Il admit..microsoft wants alotta information from you so read through all the boxes man.