BIOS options to check
CPU CONFIGURATION SCREEN AGP Freq...66
CHIPSET CONFIGURATION SCREEN
AGP Data Rate ...8X(check)
AGP Aperature...I guess 32(check specs on what card requires)
AGP fast write...Disable
AGP side band address...Disable(not positive/getting to old to remember this stuff)
Primary Graphics Adapter...AGP
AGP voltage...AUTO
Other than that is the card in the proper slot,LOL!