Dell OptiPlex 790 (Early 2011) - Manual (Page 37)

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Power Supply
Removing the Power Supply
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. Remove the intrusion switch .
6. Remove the heat sink .
7. Disconnect the cables from the system board.
8. Remove the screw that secures the power supply to the chassis.
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