Dell OptiPlex 740 User Manual page 155

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7. Disconnect the power and data cable from the drive.
1 power cable 2
8. Disconnect the hard drive fan from the system board.
Installing a Hard Drive
1. Check the documentation for the drive to verify that it is configured for your computer.
NOTICE: To avoid damage to the drive, do not set it on a hard surface. Instead, set the drive on a surface, such as a foam pad, that will sufficiently
cushion it.
2. Unpack the replacement hard drive, and prepare it for installation.
3. If your replacement hard drive does not have the plastic drive bracket attached, remove the bracket from the existing drive by unsnapping it from the
drive.
2 hard drive
SATA data cable 3 fan cable