I haven't tried this but you might wanna give it a shot. Can you see if the system posts with a working GPU connected to the monitor and the bricked one to the other slot? If it does, check if ATIWinflash detects the bricked one. If it does, you can flash the BIOS.
Will not post if GPU0 is in, the VGA error LED just remains on the motherboard.
If GPU1 or GPU2 is in then it posts, but will not boot into Windows. I onloy have 3 cards so only have onboard video to work with.
I'll try the 1 to 8 pin tonight on GPU0 and hopefully that bypasses the VGA error otherwise i'm in trouble with that card.