Hello, I purchased a used ATI X850 XT AGP 2-slot for PC, not the single slot found as OEM on PowerMac G5s. The goal is to flash it with the equivalent Mac bios so that I can use it in my Mac G4 867MHz Quicksilver (2001). By the way, I already know that I have to cover up pins 3 and 11 in order for an 8x AGP card to work in my Apple 4x AGP slot. Anyway, I confirmed that the PC card works on an AGP Dell Tower. I used the latest ATIFlash utility from TechPowerUps to create a DOS boot floppy, saved a copy of the original bios on the X850 XT, and then flashed it with a reduced X800 XT ROM from Mac Elite Wiki (filename "ATIhack_x800xt_reduced.rom", which I renamed to x800xthk.rom for the floppy). I used the following command "atiflash -p -f 0 x800xthk.rom" (confirmed that "0" was the right slot). Well, I think it flashed, because the log file said it flashed 10000h (64K in hex) bytes; it said to reboot in order to complete VBIOS update, but of course it didn't do anything on the Dell because the card was now MAC-ified (new word?). Back home, I placed it in Quicksilver (Leopard) AGP slot...again, pins 3 and 11 are covered with tape; I also have an old Rage128 PCI card that I used to boot up into the Finder. But, the X850 XT just sits there with the fan blowing full speed and my monitor's LED stays amber and the screen black when I plug in the VGA connector. Any thoughts? Perhaps someone has better BIOS files for me to use? Thanks.