Have you tried re-seating the card ?
Take it out and put it back in again. 9 times out of 10 you wont get much because the cards need a good shove in the AGP slot.
If it still refuses to boot, do you have a friend who could try the card in there rig for you. You could exchange cards to test his card in yours and your card in his.
Im sure others have some suggestions as well...