I have a Powercolor 4670 and have followed the guide started in this Thread as well as guide in the youtube link. I have not had any luck at all. Stock kexts on 10.6.4 and I just get blank screen on boot. Monitor then searches between analog and digital and then sleeps. I have tried all bootloaders. Anyone have any suggestions what else to try.
I wish I could find someone who actually has the Powercolor card. I have a feeling something is different with this one causing problems!