Shut down the operating system, remove any media (DVDs, CDs, or tapes) from the drives, and turn off all attached devices.
Unplug all power cords from electrical outlets.
Disconnect all cables attached to the computer. This includes power cords, input/output (I/O) cables, and any other cables that are connected to the computer.
Press the buttons on the sides of the computer and pivot the cover upward to open.