Dell Precision Workstation 450 User Manual page 110

1 power cable
2 hard-drive cable
Serial ATA Drive
1 power cable
2 serial ATA hard-drive cable
8. Check all connectors to be certain that they are properly cabled and firmly seated.
9. Close the computer cover.
NOTICE: To connect a network cable, first plug the cable into the network wall jack and then plug it into the computer.
10. Connect your computer and devices to electrical outlets, and turn them on.