Hey macrumors, i have and old powerbook g4 from 2003, 17 inch model, and it is compatible with Mac OS X Tiger 10.4, But when i start it with the cd for tiger, (old cd with tiger that i kept) first i choose language, and it says preparing installation, then it says This software can not be installed on this computer, it does say iMac G5 on the cd, but i don't remember needing different cds for each computer? Help?