Dell OptiPlex 740 User Manual page 158

1 drive release latch 2 optical drive
4. Disconnect the power and data cable from the back of the drive.
1 optical drive 2 data cable 3 power cable
Installing an Optical Drive
1. Unpack the drive and prepare it for installation.
2. Check the documentation that accompanied the drive to verify that the drive is configured for your computer.
3. Connect the power and data cable to the drive.
1 optical drive 2 data cable 3 power cable
4. Gently position the drive until it clicks into place.