Dell Precision T7400 (Late 2007) - Manual (Page 238)

238 Adding and Replacing Parts
11 Ensure that all connectors are properly cabled and firmly seated.
12 Replace the computer cover (see "Replacing the Computer Cover" on
page 145).
NOTICE: To connect a network cable, first plug the cable into the network port or
device and then plug it into the computer.
13 Connect the computer and devices to electrical outlets, and turn them on.
See the documentation that came with the drive for instructions on
installing any software required for drive operation.
1 power cable 2 data cable
3 SAS interposer connector 4 HDD connector
4
1
2
3