New, original Apple service spare, combined DC-in & sound board for the dual layer Superdrive (1440x960 screen) version of the 1.67GHz 15" Aluminium PowerBook G4 only. This part will not fit any other versions of the PowerBook. This unit comprises the DC-in socket, the sound in & out mini-jack sockets and the left hand USB port. It connects to the logic board via the DC-cable and the audio flex cable, and to the speaker assembly.