HP Compaq Series Hardware And Software Manual page 116

Memory Modules
12. To insert a new memory module into the memory
module slot:
a. Align the keyed (notched) edge 1 of the module with the
b. Press the module 2 into the slot from a 45-degree angle
c. Press the module downward 3 until the retention clips
8–10
keyed area in the expansion slot.
until it is seated.
snap into place.
Hardware and Software Guide