Shut down the computer. If you are unsure whether the computer is off or in Hibernation, turn on the computer, and then shut it down through the operating system.

Disconnect all external devices connected to the computer.

Disconnect the power from the computer by first disconnecting the power cord from the AC outlet and then disconnecting the AC adapter from the computer.

Disconnect the fan cable from the system board.

Loosen the four Phillips PM2.5×7.0 captive screws that secure the fan/heat sink assembly to the system board with a Phillips 0 screwdriver.