HP Pavilion dv3-4001tx Entertainment Notebook PC - Manual (Page 95)

NOTE: If you removed a memory module from the expansion memory slot before removing the
primary memory module, replace the memory module in the expansion memory module slot.
12. Close the cover (2).
13. Tighten the memory/wireless module compartment cover screw (3).
14. Replace the battery.
15. Turn the computer right-side up, and then reconnect external power and external devices.
16. Turn on the computer.
Adding or replacing memory modules 85