[CentOS] Video Card

Today I bought a PNY 9600 GT, installed the latest NVIDIA 64-bit
drivers (177.82) and I still can't get anything but the 640x480
display.

BTW, my display is a Rosewill R943J LCD (without EDID).  And I'm using
its DVI connector.

Any ideas?  I'm going to try the analog connector now just for fun: no change.

Any suggestions for an equivalent ATI (AMD) card that is known to work?

Thanks.

-Tom