PowerBook G4 Graphics Update 1.0 improves graphics stability for some 1.67-GHz PowerBook G4 computers. The update is for the following systems:
PowerBook G4 (15-inch, 1.67 GHz)
PowerBook G4 (17-inch, 1.67 GHz)
The update requires Mac OS X 10.4.2, and is available either through Software Update or as a 2.1 MB standalone download.