Dell Precision T7400 (Late 2007) - Manual (Page 213)

Adding and Replacing Parts 213
NOTICE: Do not route card cables behind the cards. Cables routed behind the
cards could cause damage to the equipment.
10 Connect any cables that should be attached to the card.
See the documentation for the card for information about the card’s cable
connections.
11 Rotate the card retainer back into its original position; push its tip so that
its tab clicks into place.
1 bracket inside of slot 2 bracket caught outside of slot
3 fully seated card 4 not fully seated card
3
4
2
1