Dell XPS 8500 (Early 2012) - Manual (Page 25)

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Replacing the Computer Cover
1 Connect all the cables and fold the cables out of the way.
2 Ensure that no tools or extra parts are left inside the computer.
3 Align the tabs at the bottom of the computer cover with the slots located
along the edge of the chassis.
4 Press the computer cover down and slide it towards the front of the computer.
5 Replace the thumbscrew that secures the computer cover to the chassis.
1 thumbscrew 2 slots
3 computer cover
6 Place the computer in an upright position.
7 Follow the steps in "After Working Inside Your Computer" on page 15.
Computer Cover 25