There are many different types of screws in this step so make sure to arrange the screws by their different sizes.

Unscrew the six 17 mm Phillips head screws on the stands on the back and the 2 "A" screws of the same size adjacent to the stands.

Unscrew the two C Phillips head screws on the hard drive panel. There is also one more C screw in the upper right corner of the laptop as shown.

Unscrew the eight 8mm lock phillips screws and the screws along the outside of the laptop.

Unscrew the three 3mm E Phillips screw and the one 3mm D Phillips screw.

Unscrew the 5mm Phillips head screw that lies just above the D screw.