Dell OptiPlex 790 (Early 2011) - Manual (Page 43)

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System Fan
Removing The System Fan
1. Follow the procedures in Before Working Inside Your Computer .
2. Remove the cover .
3. Remove the front bezel .
4. Disconnect the system-fan cable from the system board.
5. Unthread the system-fan cable from the chassis clips.
6. Slide the four grommets inward and through the slots in the front of the computer.
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