HP dx6120 Hardware Reference Manual page 32

Hardware Upgrades
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c. If removing a PCI Express 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. Pull the expansion card straight up
from the socket then away from the inside of the chassis to
release it from the chassis frame. Be sure not to scrape the
card against the other components.
Before removing an installed expansion card, disconnect any cables
that may be attached to the expansion card.
Removing a PCI Express Expansion Card
5. If not replacing the old expansion card with a new expansion
card, install an expansion slot cover to close the open slot. Insert
the metal slot cover in the opened slot and slide the slot cover
lock down to secure the slot cover in place.
CAUTION: After removing an expansion card, you must replace it with a
new card or expansion slot cover for proper cooling of internal
components during operation.
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