HP ProDesk 400 G1 Maintenance And Service Manual page 111

5.
Before installing an expansion card, remove the expansion slot cover or the existing expansion
card.
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, remove the appropriate expansion
slot cover on the back of the chassis. Pull the slot cover straight up then away from the inside
of the chassis.
b.
If you are removing a 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.
Expansion card
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