My friend has older compaq pc with a 900mhz AMD Duron processer and I can't seem to get the agp port to work on it. It has an onboard card that shares the system memory and it came with a 16mb agp graphics card as well. But it doesn't seem to over ride the board one. I've looked at the bios setting and i don't see any where on how to turn off the onboard. The bios is very different from others and it has very few settings. Have any idea on why the agp one is not working.