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Remove the power button board cable (5).
Position the computer upside down, with the front toward you.
Remove the four Phillips M2.5x4.0 screws inside the battery bay and the two Phillips M2.5x4.0
screws in the optical drive/upgrade drive bay (1).
Remove the eight Torx M2.5x6.0 screws (2) that secure the base enclosure to the top cover.
Position the computer right-side up.
Grasp the top cover by the hole in the optical disk drive/upgrade drive bay and lift up the front
edge of the top cover (1).
Component replacement procedures