Removing the Cover
Follow these steps to remove the cover from your computer:
1.Turn off the computer and then any peripheral devices (including the monitor and printer).
2.If the monitor is on top of the computer, lift it off and set it to one side.
3.Disconnect the computer’s power cable from the electrical outlet and from the back panel. Then disconnect any peripheral device cables that are connected to the computer, including the keyboard cable.
4.Turn the computer around so the back panel is facing you. As shown below, the cover is secured by a large screw. Turn the screw counterclockwise to unlock the cover.
screw