When you use Apple Hardware Test on a PowerBook G4 (12-inch 1.5GHz), PowerBook G4 (15-inch 1.67/1.5GHz), or PowerBook G4 (17-inch 1.67GHz) computer, the trackpad will track very slowly and the pointer may seem to move unevenly across the screen.
This behavior is normal for the trackpad when used with Apple Hardware Test. To improve navigation when using this software, use an external mouse or use the following keyboard shortcuts: