Dell OptiPlex 990 (Early 2011) - Manual (Page 33)

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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. Remove the drive cage .
5. Disconnect the power-switch cable from the system board.
6. Unthread the power-switch cable from the chassis clip.
7. Pry the power-switch cable away from the chassis.
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