I have a e-machine it has 4 gb memory bigger power supply aftermarket. I bought a new graffic card. I installed it also ran the disk that came with it and now my screen looks like a checkered board. The graffic card is a geforce gt 640. What am I doing wrong not to be able to use my computer?
Computer building/upgrading 101, never use the CD that comes with new hardware always go onto the manufactures website and download the latest drivers. What CPU do you have, does it have onboard graphics?