7.For 4540s models, remove the following screws that secure the top cover to the computer:
(1)2 Phillips PM2.0×2.5 screws from the optical drive bay
(2)3 Phillips PM2.0×2.0 broadhead screws from the battery bay
8.For 4440s/4441s models, remove the following screws that secure the top cover to the computer:
(1)3 Phillips PM2.0×2.5 screws from the optical drive bay
(2)2 Phillips PM2.0×2.0 screws from the battery bay
72 Chapter 4 Removal and replacement procedures