Don't touch the card.
If the card is a Built by ATI card, you have a 3 year warranty on it. Yes. I said 3 year warranty.
Definetly check your system ram. run memtest86+, try reseating the ram (make sure your are grounded) in case you have jossled your chassis lately.
The other thing to check is to ensure that the external power adaptor is connected properly to the card and that the card is seated properly in the slot. Lack of power will prevent you from getting 3D accelleration and an improperly seated card may slow the system down or potentially cause shorts between the traces.
Go to www.atitech.ca or www.ati.com, and go to their RMA site and check it out before you start messing with the card.