HP ProDesk 600 Hardware Reference Manual page 31

c. If you are removing a PCI Express x16 card, pull the retention arm on the back of the
expansion socket away from the card and carefully rock the card back and forth until the
connectors pull free from the socket. Lift the card straight up to remove it. Be sure not to
scrape the card against other components.
9. Store the removed card in anti-static packaging.
10. If you are not installing a new expansion card, install an expansion slot cover to close the open
slot.
CAUTION:
expansion slot cover for proper cooling of internal components during operation.
11. To install a new expansion card, slide the bracket on the end of the card down into the slot on
the back of the chassis and press the card down firmly into the socket on the system board.
NOTE:
connector seats properly in the expansion card slot.
ENWW
After removing an expansion card, you must replace it with a new card or
When installing an expansion card, press firmly on the card so that the whole
Removing or installing an expansion card 23