Dell XPS 8500 (Early 2012) - Manual (Page 78)

4
5
3
2
1
1 slots 2
3 top-cover tabs 4
5 top cover
release tab
top panel
Replacing the Top Cover
1 Align the tabs on the top cover with the slots on the top panel.
2 Press and slide the top cover towards the back of the computer, until it
clicks into place.
Top Cover 78