Preparing an EXISTING Heatsink for Re-installation. If you have a new heatsink, follow the NEW Heatsink procedure.

Using the alcohol pad included with the logic board or processor replacement part, clean off any used thermal grease from the processor and the bottom of the heatsink.

Using the thermal grease included with the logic board or processor replacement part, apply one dot of fresh grease to the raised square area on the bottom of the heatsink.

Spread the grease evenly across the square to a thickness of approximately 1 mm.