12-inch iBook G4 (Mid 2005), 10.4.9, Combo drive (CW-8124).
I'm not sure why with the same DVD movie, my iBook G4 seems to think the disc is dirty or scratch, but no problem watching it on my PowerMac G4 w/a SONY DW-Q120A DVD burner. The iBook G4 was in battery mode when watching DVD with plenty of juice. Any idea? I still have AppleCare on it anyway.