HP dc7900 - Convertible Minitower PC Hardware Reference Manual page 28

NOTE:
to the expansion card.
a. If you are installing an expansion card in a vacant socket, remove the appropriate expansion
slot cover on the back of the chassis. Lift the expansion slot cover from the expansion slot.
Figure 2-11
b. If you are removing a standard PCI card, hold the card at each end and carefully rock it 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.
Figure 2-12
22 Chapter 2 Hardware Upgrades
Before removing an installed expansion card, disconnect any cables that may be attached
Removing an Expansion Slot Cover
Removing a Standard PCI Expansion Card
ENWW