The PowerBook G4 was introduced in January 2001 and would have originally had Mac OS 9 installed. The first version (10.0) of Mac OS X, known as Cheetah, was introduced in March 2001.
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The Apple Powerbook G4 was manufactured for five years between the years of 2001 to 2006.The Apple Powerbook G4 is a series of notebook computers. It was part of a Powerbook line from Apple.