Dell Dimension 4550 Series Owner's Manual page 91

If you are removing the card permanently, install a filler bracket in the
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empty card-slot opening.
card bracket
filler bracket in empty
card-slot opening
If you need a filler bracket, contact Dell.
NOTICE: Installing filler brackets over empty card-slot openings is necessary
to maintain FCC certification of the computer. The brackets also keep dust and
dirt out of your computer.
Lower the retention arm and press it into place, securing the card(s) in
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the computer.
NOTICE: To connect a network cable, first plug the cable into the network
wall jack and then plug it into the computer.
Close the computer cover, reconnect the computer and devices to
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electrical outlets, and turn them on.
Remove the card's driver from the operating system.
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card
slot connector
system board
91
Adding Pa rts