also i cannot connect itunes to the internet and i cant install a new version of itunes
There are no further Mac OS X updates or upgrades for that configuration. Click here if you're running an iTunes version prior to 10.6.3.
is it impossible to have mountain lion?
It is impossible to install any Mac OS X version newer than 10.5.8 on it.
For clarity, all operating systems after OS X 10.5 Leopard require an Intel processor. Your Powerbook has a PowerPC G4 processor.
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