14.Before installing a replacement top case, check the cable routing of the

Microphone cable

Trackpad cable

Power button cable

Make sure the cables are routed correctly and cannot be pinched when installing the top case.

15. Install the replacement top case, and reassemble and test the computer.

32 - PowerBook G4 (12-inch) Take Apart

Top Case

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Apple G4 (12-INCH DVI) manual