Dell Precision T5400 (Late 2007) - Manual (Page 199)

Adding and Replacing Parts 199
12 Rotate the card retention door until it snaps into place.
NOTICE: Do not route card cables over or behind the cards. Cables routed over the
cards can prevent the computer cover from closing properly or cause damage to
the equipment.
13 Connect any cables that should be attached to the card.
See the documentation for the card for information about the card’s cable
connections.
14 If the card was installed in a slot close to the hard-drive carrier, check to see
if there are any cables or other protrusions that might block the card
retention mechanism from being lowered completely. If this is the case:
1 card retention door 2 release tab
1
2