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

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Power-Switch Cable
Removing The Power-Switch Cable
1. Follow the procedures in Before Working Inside Your Computer .
2. Remove the cover .
3. Remove the front bezel .
4. Disconnect the power-switch cable from the system board.
5. Pry the power-switch cable free.
6. Slide the power-switch cable out through the front of the computer.
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