HP Pro 3000 SFF Hardware Reference Manual page 17

NOTE: Before removing an installed expansion card, disconnect any cables that may be attached
to the expansion card.
a. If you are installing an expansion card in a vacant socket, you must use a flatblade screwdriver
to pry out the metal shield on the rear panel that covers the expansion slot. Be sure to remove
the appropriate shield for the expansion card you are installing.
Figure 10 Removing an Expansion Slot Cover
b. If you are removing a PCI or PCI Express x1 card, hold the card at each end and carefully
rock it back and forth until the connectors pull free from the socket. Be sure not to scrape the
card against the other components.
Figure 11 Removing a PCI or PCI Express x1 Expansion Card
Removing or Installing an Expansion Card 11