Can using a geforce 6200 agp with taped pin 3 + 11 and apple firmware bios brick the cpu? I have a quicksilver 933 and it worked fine for 2 days, even done some work in illustrator on it, and then when I left it running Leopard and came back it was frozen, restarted and it gave the bong and 3 power led flashes. Swapping the CPU board fixes it.