Dell Precision T7400 (Late 2007) - Manual (Page 206)

206 Adding and Replacing Parts
NOTICE: Do not route card cables behind the cards. Cables routed behind the
cards could cause damage to the equipment.
8 Connect any cables that should be attached to the card.
See the documentation for the card for information about the card’s cable
connections.
9 Rotate the card retainer back into its original position; push its tip so that
its tab clicks into place.
10 Reconnect the data cable to each installed hard drive.
11 Reconnect the hard drive power cable to each installed hard drive.
12 Ensure that all connectors are properly cabled and firmly seated.
13 Press the card retention device back into its original position; push it down
until it clicks into place.
1 release tab 2 card retainer
1
2