Dell OptiPlex 755 - Manual (Page 51)

3. Mount the bracket into the desired card slot opening.
4. Plug the free end of the eSATA cable into the eSATA connector on the system board (see System Board Components ).
5. Replace the computer cover (see Replacing the Computer Cover ).
6. Boot your computer and enter system setup (see Entering System Setup ). Use the esata option to enable the eSATA drive.
Installing eSATA With a Riser
1. Remove the computer cover (see Removing the Computer Cover ).
2. Remove the riser from your computer.
3. Press the blue release tab to remove the filler panel for the card slot you are using for the eSATA connector.
4. Insert the bracket for the eSATA connector into that opening and press down on the release tab to hold the bracket in place.