Dell Dimension 4550 - Manual (Page 89)

Adding Parts 89
NOTICE: Do not route card cables over or behind the cards. Cables routed
over the cards can prevent the computer cover from closing properly or cause
damage to the equipment.
13 Connect any cables that should be attached to the card.
See the documentation for the card for information about the card’s
cable connections.
NOTICE: To connect a network cable, first plug the cable into the network
wall jack and then plug it into the computer.
14 Close the computer cover (see page 104), reconnect the computer and
devices to electrical outlets, and turn them on.
15 Install any drivers required for the card as described in the card
documentation.
filler
bracket
alignment bar
alignment guide
card retention arm