Compaq dx2390 Microtower Hardware Reference Manual page 25

5. Remove the computer access panel.
6. Locate the correct vacant expansion socket on the system board and the corresponding expansion
slot on the back of the computer chassis.
7. On the rear of the computer, a slot cover lock secures the expansion card brackets in place.
Remove the screw from the slot cover lock then slide the slot cover lock up to remove it from the
chassis.
Figure 2-9 Opening the Slot Cover Lock
8. Before installing an expansion card, remove the expansion slot cover or the existing expansion
card.
Removing or Installing an Expansion Card 19