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