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Feb 16, 2016 4:05 PM in response to HenryPowerPcby a brody,Please note: 10.4(.0), (April 29, 2005), 10.4.3 (October 31, 2005), 10.4.6 (April 3, 2006) were all retail releases that did not say Upgrade, Dropin, or OEM. Using this tip, identify the age of your iMac:
http://discussions.apple.com/docs/DOC-6413
And make sure your 10.4 installer disc you used is not older than the Mac in question.
Also make sure the disc does not say Upgrade, Dropin, or OEM, unless you know for certain it is the installer disc that came with the Mac.
If the Mac is older than one of the Tiger releases, try to get a tiger retail disc as shown on this tip that is newer:
http://discussions.apple.com/docs/DOC-2541
If that is not the problem do you have anything besides a mouse connected to your Mac along with the keyboard? If you do, remove that before you try to boot.
If that is not the problem, try booting in safe mode (holding the shift key at startup).
If there is still a problem, look at this tip for replacing the backup battery:
https://manuals.info.apple.com/MANUALS/0/MA47/en_US/imacG5_allModels_BackupBatte ry.pdf
If it is still problematic, let us know which iMac G5 you have and tell us how far along you come on the startup screen.