HP ProBook 4321s Notebook-PC - Manual (Page 132)

8. Remove the 2 screw covers (1) and screws (2) from the back edge of the computer.
NOTE: Some models do not have any screw covers or screws to remove.
9. Turn the computer display-side up, and then open the computer as far as possible.
CAUTION: Do not use excessive force to open the computer beyond the limits of the display
hinges. Forcing extension beyond these limits will cause damage to the display.
10. Slide the switch cover straight back toward the display (1), and then remove the switch cover (2).
120 Chapter 9 Memory modules