Hi I just got an ibook 4g and was wondering what system I can use on it
It depends on the specifications of the iBook in question.
If its bellow 867 Mhz processor speed then you can install Mac OS X 10.4 Tiger.
Anything above up to 1.4ghz will allow you to install Mac OS X 10.5 Leopard.
Alternately you could install Linux for PPC Mac
Hope this helps.
This link is to an Apple chart regarding which iBook G4 you have.
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