PowerMac G5 - ATI Radeon Mac Edition + Apple 30" Cinema Display Issues

Hi everybody,
I just bought a 30" Apple Cinema Display for my (old but good) PowerMac G5 (2x2GHz).
I'm using Leopard 10.5.6. When hooked up to the running system everything ist fine. But i recently had to reinstall Leopard and then I noticed, that after I boot from the DVD the whole screen went black/grey - so no colors at a very low resolution. So I had to do a "blind" install. Does anybody know why this happens? And is a fix availbable? Same thing happens when I boot into a NetInstall oder Netboot Image - the whole screen becomes black/grey as if the OS couldn't find a Color Profile and/or Driver.
As said before - once Leopard is installed everything works fine.
Thank you for your help.
Best regards,
Georg Lechner

Ok, I think I kind of "solved" the problem. The issue has nothing to do with the Apple Cinema Display. I got the chance to hook up another display to that specific PM G5. Happens also with an BenQ TFT.
I think the problem is the installed Radeon 9600 Pro. Gives only black/grey during installation. (even with the 10.5.6 Install Disc)
No big deal so far. Problem solved for me, cause i switched from radeon to a geforce 6800 Ultra DLL.

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