Compaq Armada M300 Series Reference Manual page 60

8. Place the removed memory expansion board in an
electrostatic-safe container.
9. To add a memory board, insert the memory expansion board
into the empty memory expansion slot at a 45-degree angle
Then slide it gently into place until it is seated while tilted.
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
11. Replace the memory insulator, if applicable.
12. Replace the keyboard by gently pressing down on the top of
the keyboard until it clicks into place.
snap into place.
.