HP Compaq Presario,Presario 4400 Hardware Reference Manual page 42

Hardware Reference Guide
5. If you are adding a new expansion card to the computer, remove
the screw 1 securing the slot cover, then remove the expansion
slot cover 2 from the slot.
Removing the Screw and Expansion Slot Cover
6. Add or replace an expansion card to a slot by aligning the edge of
the expansion card with the slot on the chassis and gently
pressing the card straight down into the expansion slot 1.
Reinstall the screw that secures the card to the chassis 2.
7. If you have replaced or added a new expansion card, store the old
card in the anti-static packaging that contained your new card.
Computer Upgrades
3–25