HP Notebook PC User Manual page 91

11. Replace the bottom door (1) sliding it securely into place (2).
12. Tighten the bottom door screws (3).
NOTE: Refer to the illustration that most closely matches your computer.
13. Replace the battery.
14. Turn the computer right-side up, and then reconnect external power and external devices.
15. Turn on the computer.
Adding or replacing a memory module in the expansion memory module slot 79