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Replacement power adapters for the iBook G3 ClamShell (M24353) are widely available. (See links below).
The iBook G4 was discontinued in 2006.
You can access MySpace on an iBook.
There are no known viruses that affect a G4 iBook.
In order to use wi-fi with an iBook Clamshell, you need an Air Port card. It needs to be the old type.