6.Pull the cover away from the front of the computer to completely remove it. Then set it aside.
7.Before you touch any of the components inside, touch the inside of the computer’s back panel, as shown below, to ground yourself and avoid an electric shock.
WARNING
Be sure to ground yourself to the inside back panel of the computer every time you remove the cover. If you are not properly grounded, you could generate an electric shock when you touch a component.