HP Compaq dc5100 MT Hardware Reference Manual page 31

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Hardware Reference Guide
b. If removing a PCI expansion 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 2 to
release it from the chassis frame. Be sure not to scrape the
card against the other components.
Removing an Expansion Card
Before removing an installed expansion card, disconnect any cables
that may be attached to the 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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