Dell Dimension 4550 - Manual (Page 104)

104 Adding Parts
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Closing the Computer Cover
1 Ensure that all cables are connected, and fold cables out of the way.
Ensure that cables are not routed over the drive cage—they can
prevent the cover from closing properly.
2 Ensure that no tools or extra parts are left inside the computer.
3 Pivot the cover down and ensure that the release buttons click into
place.
NOTICE: To connect a network cable, first plug the cable into the network
wall jack and then plug it into the computer.
4 Connect your computer and devices to electrical outlets, and turn
them on.