After my motherboard fried i got a new one and connected the graphics card that was used in the old motherboard. It works but its not detected in my system so everything looks funky and i can't play games. My graphics card is the gtx 650 1gb
Did you add the drivers for the old GPU? What OS are you using? If you are not using a self detecting OS (like Win 8) then you have to install the drivers yourself. You can go to Nvidia.com and download the latest driver there.