Compaq 247320-003 - Deskpro 4000 - 5166 Model 2500/CDS Reference Manual page 104

To remove an expansion board, follow these steps:
1. Remove the expansion board cage.
2. Disconnect any cables attached to the expansion board.
3. Remove the screw at the side of the expansion slot.
4. Hold the board at each end and carefully rock it back and
forth until the connectors pull free from the slot. Be sure
not to scrape the board against other components.
5. Store the board in antistatic packaging.
6. Install an expansion slot cover to close the open slot.