I have a DELL Optiplex GX240 pc, the one that looks like a brifecase. It has an ATI rage 128 pro ultra agp gl 4x card but I wanted a 3d card so I have an a ATI 3d rage pro turbo agp but the pc is a low profile system so the card would not match up to the agp slot. so i bought a card for pci but the monitor will not show, so how do you disable a agp slot so the pci will run instead?