Dell OptiPlex 990 (Early 2011) - Manual (Page 37)

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Input/Output Panel
Removing The Input/Output (I/O) Panel
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. Unthread the I/O panel or the FlyWire cable from the fan-shelter clip and
heat sink.
6. Disconnect the I/O panel or the FlyWire cable from the system board.
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