Dell Precision T5400 (Late 2007) - Manual (Page 154)

154 Adding and Replacing Parts
5 Locate the three hinge tabs on the edge of the computer.
6 Grip the sides of the computer cover and pivot the cover up, using the
hinges as leverage points.
7 Release the cover from the hinge tabs and set it aside in a secure location.
NOTICE: The computer cooling system cannot function properly while the
computer cover is not installed. Do not attempt to boot the computer before
replacing the computer cover.
1 cover latch release 2 computer cover
3 cover hinges
2
3
1