Compaq Evo N400c Hardware Manual page 89

9. To add a memory board, insert the memory expansion board
into the empty memory expansion slot at a 45-degree
angle 1, then slide it gently into place until it is seated while
tilted. If a memory board is already installed, remove it. Refer
to "Removing a Memory Board" in this chapter.
All memory expansion boards supported by the computer are
keyed (notched) to ensure correct positioning.
10. Push the memory expansion board down until the plastic
retention clips 2 snap into place.
11. Replace the palm rest reinstall all screws.
Hardware Guide
Computer Upgrades and Add-ons
8–9