Dell OptiPlex 390 (Mid 2011) - Manual (Page 37)

Input/Output Panel
14
Removing The Input/Output (I/O) Panel
1. Follow the procedures in Before Working Inside Your Computer .
2. Remove the cover .
3. Remove the front bezel .
4. Remove the drive cage .
5. Unthread the I/O panel/FlyWire cable from the fan shelter clip and heat
sink.
6. Disconnect the I/O panel/FlyWire cable from the system board.
7. Remove the single screw that secures the I/O panel to the chassis.
37