Dont know much about video cards, but you could try checking your bios if you have vga palette snoop enabled, usually thats for most older cards that have color problems or errors, so make sure that is disabled.
Also check your motherboard specifications/bios for agp/pci shared slots.
Are you booting off the card?
Also check your motherboard specifications/bios for agp/pci shared slots.
Are you booting off the card?