Proper troubleshooting for a situation like this would necessitate installing the card in another XP system, different motherboard, to eliminate any issue with the ATI card.
Where did the card come from?
ATI AIW cards are too often ruined by moron eBay
sellers sending card in envelopes. There are way too many components on those boards to be smashed in the mail. If I ever got something like that, I'm not even wasting my time to test it, back it goes.