I got my second PCI X Powermac G5 Ultra OEM Mac 6800 DDL card yesterday. Was displaying grey vertical lines at start up then static frame. I googled around and decided to pull off the heat sink and fan to see if it might work without the accoutrements... ... it worked for one hot second, perfectly then flat nothing. Did I burn out the card? It ran for thirty seconds, top. Tried it again, and nothing not even at start up. So bummed, my other Ultra works great. Who can fix these things I wonder? Nvidia said I had to call Apple about fixing them!