GTX 650 Ti windows 8 not detected by gateway DX4870

I bought a DX4870 and i upgraded the power supply to a corsair cx500w, it worked fine; pc turns on and everything is godo to go. I then tried to install a gtx 650 ti. The fans of the card are moving but i am getting nothing else. Is there seomthing to do with windows 8? also i tried the windows 8 drivers and they didnt detect it either.

The card is not being detected at all in device manager. Could the card be dead or not working? i have pci 3.0 so i dont think its my mobo since its new and all.

Link to my pc http://us.gateway.com/gw/en/US/content/model/DT.GDDAA.0...
Power supply http://www.newegg.com/Product/Product.aspx?Item=N82E168...
Gtx 650 http://www.newegg.com/Product/Product.aspx?Item=N82E168...