Recently I purchased a parts & repair PowerBook G4 that actually works just fine from Goodwill. It is the 1.5/1.33 GHz series (1.5 GHz model) and shipped with the optional keyboard backlight. The thing that I noticed is that the keyboard backlight is much more dim than the 1.5/1.67 GHz series (1.67 GHz model) PowerBook I already owned. When compared between this 1.5 GHz, the 1.67 GHz PowerBook, and my MacBook Pro, the 1.5 GHz looks really dim in comparison. Is it possible that the old age is simply wearing the light out? People who own this model or earlier ones would you be able to compare?