4.Release the lever 1holding the microprocessor heat sink.
5.Remove the heat sink, and do one of the following:
v If you are replacing the microprocessor, place the old heat sink aside. You must use the new heat sink shipped with the new microprocessor.
Note
Do not use the old heat sink with the a new microprocessor. If you use the old heat sink with the new microprocessor, your computer might overheat causing intermittent problems.
vIf you are replacing the system board, carefully place the heat sink on its side on a clean, flat surface so the thermal interface on the bottom of the heat sink does not touch the surface and become contaminated.
6.Release the lever 3holding the microprocessor retainer 1, and pivot the retainer to the open position.