HP ProBook 6555b Notebook-PC - Manual (Page 118)

c. Gently press the memory module (3) down, applying pressure to both the left and right edges
of the memory module, until the retention clips snap into place.
11. Align the tabs (1) on the memory module compartment cover with the notches on the computer.
12. Close the cover (2).
13. Tighten the memory module compartment cover screw (3).
14. Replace the batteries.
15. Turn the computer right-side up, and then reconnect external power and external devices.
16. Turn on the computer.
108 Chapter 9 Memory modules