Dell OptiPlex 390 (Mid 2011) - Manual (Page 45)

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Input/Output Panel
Removing The Input/Output Panel
1. Follow the procedures in Before Working Inside Your Computer .
2. Remove the cover .
3. Remove the front bezel .
4. Disconnect the Input/Output panel or the FlyWire cable from the system
board.
5. Remove the screw that secures the Input/Output panel to the chassis.
6. Slide the Input/Output panel towards the right of the system to release from
chassis.
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