HP Compaq Pro 4300 Maintenance And Service Manual page 57

b. If you are removing a standard PCI card 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. Pull the
expansion card straight up from the socket (1) then away from the inside of the chassis to
release it from the chassis frame (2). Be sure not to scrape the card against the other
components.
NOTE: Before removing an installed expansion card, disconnect any cables that may be
attached to the expansion card.
Figure 7-11 Removing a PCI Express x1 Expansion Card
Removing or Installing an Expansion Card 49