video quit

<img src=‘http://hqnveipbwb20/public/style_emoticons/<#EMO_DIR#>/crying.gif’ class=‘bbc_emoticon’ alt=’:’(’ /> not sure what is wrong i got a new video card a PNY Verto Geforce 7600 GS.
installed in went and got the new drivers from nvidia and i can not play games now
i get no error it just pixels out and then video shuts off… it is a sli pci express 512 MB.
i have a Asus P5NSLI motherboard… can anyone help me