Dell OptiPlex 740 - Manual (Page 113)

8. Locate and connect a SATA cable to the SATA1 connector on the system board (see System Board Components for mini tower computers).
9. Replace the computer cover (see Replacing the Computer Cover ).
Drive-Panel Inserts
If you are installing a new floppy drive, media card reader, or optical drive instead of replacing a drive, remove the drive-panel inserts.
1. Follow the procedures in Before You Begin .
2. Remove the drive panel by sliding the drive release latch in the direction indicated on the latch to open the panel. Then remove it from the hinges.
1 hard-drive data
cable
2 hard-drivedata cable on system
board
3 hard-drive power
cable