Dell OptiPlex 755 User Manual page 166

1 media card reader data cable
5. Replace the optical drive (see
6. Check all cable connections, and fold cables out of the way to provide airflow for the fan and cooling vents.
7. Replace the computer cover (see
8. See the documentation that came with the drive for instructions on installing any software required for drive operation.
9. Verify that your computer works correctly by running the Dell Diagnostics (see
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Optical Drive).
Replacing the Computer Cover).
Dell Diagnostics).