Remove the following four screws that hold the base to the motherboard:

One 1.5 mm Phillips #1 screw located near the center of the laptop.

One 1.5 mm Phillips #1 screw located at the top, center, next to the metal guard.

This screw is concealed by a black wire running across the top of the laptop. You will have to move the wire to the right in order to remove the screw.

Two 1.5 mm Phillips #1 screws located next to the fan.