Hi, I have a DC5750 with AMD Radeon X300 integrated graphics. Awhile ago I got an EVGA GeForce GT 630 w/2gigs vRAM and upgraded to Windows 7 64 bit. Since then, I haven't needed to use the integrated graphics until now. But when I try to use that card, it doesn't detect that it's there. I've installed the correct drivers and the catalyst control center but none of those detect it either. Also, it doesn't show up in the device manager at all, not even as a standard VGA adapter. Any thoughts? I tested it a few months back and it was working fine then. I think it has something to do with upgrading to Windows 7.