I have an old Dell Dimension 8300 in which the original Radeon 9800Pro had burned out. I purchased a BFG Geforce 7800GS OC and a BFG 450watt PSU with which to run it. I have installed the new PSU and it works fine but when I connect the 7800GS, the computer starts to boot but I get no picture to the monitor. I suspect that it is an incompatibility issue between the PC and the graphics card, does anyone have any suggestions as to how it can be resolved, BFG tech support have been quite unhelpful, they tried to convince me that I needed to disable the embedded display adapter in the device manager, but it only shows whatever is connected through the AGP slot, no embedded display adapter is present.