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10.5: Install 10.5 on an unsupported PowerPC iMac
Authored by: winddog on Dec 24, '07 11:58:27AM

Update:- As I stated above, replacing the graphics drivers with the drivers from 10.4 does fix the sleep issue. Unfortunately I have found some applications such as toast will not run, my guess is that quartz extreme is disabled with the 10.4 drivers. I have read reports of supported GeForce cards having similar issues, my recommendation would be disable sleep in System Preferences and hope that 10.5.2 fixes the issue.

The firmware install method above works fine (it is a temporary modification that is reset when the machine is rebooted), just remember to disable sleep or when the machine awakes the video will be unreadable and you will have to use the power switch to reboot.

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