9.Check that the perimeter metal tabs are not bent.

Note: Do not bend the tabs; the metal quickly fatigues and can break off easily.

10.Lay the top case upside down and locate the flex cable.

11.While pulling the cable up, run a finger along its base to crease it at a 90-degree angle.

Top Case

PowerBook G4 (17-inch) Take Apart - 23

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Apple Powerbank G4 manual