11.To install a new expansion card, hold the card just above the expansion socket on the system board then move the card toward the rear of the chassis (1) so that the bottom of the bracket on the card slides into the small slot on the chassis. Press the card straight down into the expansion socket on the system board (2).
NOTE: When installing an expansion card, press firmly on the card so that the whole connector 
seats properly in the expansion card slot.
12.Rotate the slot cover retention latch back in place to secure the expansion card.
13.Connect external cables to the installed card, if needed. Connect internal cables to the system board, if needed.
14.Replace the computer access panel.
15.Reconnect the power cord and turn on the computer.
16.Lock any security devices that were disengaged when the computer access panel was removed.
17.Reconfigure the computer, if necessary.
Removing or installing an expansion card 17