Dell OptiPlex 390 (Mid 2011) - Manual (Page 46)

7. Remove the Input/Output panel.
Installing The Input/Output Panel
1. Insert the Input/Output panel into the slot on the chassis front.
2. Slide the Input/Output panel towards the left of the computer to secure to
the chassis.
3. Tighten the screw to secure the Input/Output panel to the chassis.
4. Connect the Input/Output panel or the FlyWire cable to the system board.
5. Install the
front bezel .
6. Install the cover .
7. Follow the procedures in After Working Inside Your Computer .
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