HP Compaq Presario C542EA Notebook PC - Manual (Page 69)

c. Press the memory module (3) down until the retention clips snap into place.
12. Align the tabs (1) on the memory module compartment cover with the notches on the computer.
13. Close the cover (2).
14. Tighten the memory module compartment cover screw (3).
15. Replace the battery pack.
16. Reconnect external power and external devices.
17. Turn on the computer.
ENWW Adding or replacing memory modules 63