Hi. I want to flash a 4870 to replace the aging and artifacting X1900XT in my Mac Pro 1,1. I've got a Sapphire Radeon HD4870 1GB Part Number 288-20E85-130SA I know some people have had success installing it, and I've tracked down the ROM they used. I've also got the cables (both tested and working). And Zeus (BTW, thanks, Cindori, you'll soon get some $ more for your efforts). And the ROM. The problem comes when I put my ATI X1900XT and my new HD4870 together in the Mac Pro (each with a power cable). A red LED comes up just behind the RAM cage, and although it's half hidden by the cage, it seems to read "CPU A" or "CPU B". When I put the 4870 alone, in the slot 1, and only the windows-dedicated hard drive, instead of booting into Windows as I'd expect it to do, well, it just doesn't boot... How can I flash the card?