HP Compaq Presario,Presario R4000 Hardware And Software Manual page 118

To insert a memory module:
a. Align the keyed (notched) edge of the module with the
b. With the module at a 45-degree angle from the surface
c. Push the module downward until the retention clips
Hardware and Software Guide
keyed (tabbed) area in the expansion memory module
slot 1.
of the expansion memory module compartment, press the
module into the expansion memory module slot until the
module is seated 2.
snap into place 3.
Memory Modules
8–5