Shut down the computer properly through the operating system, then turn off any external devices.
Disconnect the power cord from the power outlet.
You must disconnect the power cord and wait approximately 30 seconds for the power to
drain before replacing the memory module. Regardless of the power-on state, voltage is always
supplied to the memory module as long as the computer is plugged into an active AC outlet. Adding or
removing a memory module while voltage is present may cause irreparable damage to the memory
module or system board.
Disconnect all cables from the rear I/O connectors.
Press the two rear cover latches outward (1). Slide the rear cover up, and then lift it off the display head
Use the finger slots on the rear metal shield to pull the top of the shield up, and then lift the shield off
the display head.