HP Compaq dc7100 MT Hardware Reference Manual page 33

Hardware Reference Guide
7. Before installing an expansion card, remove the expansion slot
cover or the existing 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.
Removing an Expansion Slot Cover
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Hardware Upgrades
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