9.Install the replacement heatsink, and secure the screws using the following sequence:

Warning: Check the screw lengths before installing the screws. Installing a longer screw in the wrong place can permanently damage the bottom case or an internal part.

Install the two 7.5-mm long spring screws half way.

Install the remaining screws in the order indicated by the circled numbers in the following image.

Tighten the two 7.5-mm long spring screws the rest of the way.

10. Reassemble and test the computer.

Heatsink: PowerBook G4 (12-inch DVI)

PowerBook G4 (12-inch) Take Apart - 59

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Apple G4 (12-INCH DVI) manual