Dell XPS 8500 (Early 2012) - Manual (Page 86)

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1 front USB panel clamp slot 2 clamps (2)
3 front USB panel 4 screw
Replacing the Front USB Panel
1 Align and slide the front USB panel clamps into the front USB panel
clamp slot.
2 Replace the screw that secures the front USB panel to the front panel.
3 Connect the front USB panel cables to the system board connector
F_USB2. See "System-Board Components" on page 21.
Front USB Panel 86