Dell Precision T5400 (Late 2007) - Manual (Page 161)

Adding and Replacing Parts 161
2 Pull the front-panel release lever, and slide the panel to the right to engage
and secure the front panel.
Replacing the Computer Cover
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 Ensure that all cables are connected, and fold cables out of the way.
Gently pull the power cables toward you so that they do not get caught
underneath the drives.
2 Ensure that no tools or extra parts are left inside the computer.
3 Replace the cover:
1 front-panel release lever 2 front panel
2
1