Dell XPS 8500 (Early 2012) - Manual (Page 91)

Replacing the Power Button Module
1 Align and push the power button module tabs into the slots on the top
panel.
2 Connect the power button module cable to the system board connector,
F_PANEL. See "System-Board Components" on page 21.
Postrequisites
1 Replace the top cover. See "Replacing the Top Cover" on page 78.
2 Replace the optical drive. See "Replacing the Optical Drive" on page 69.
3 Replace the front bezel. See "Replacing the Front Bezel" on page 33.
4 Replace the computer cover. See "Replacing the Computer Cover" on
page 25.
5 Follow the steps in "After Working Inside Your Computer" on page 15.
Power Button Module 91