Dell Precision T3400 (Late 2007) - Manual (Page 217)

Adding and Replacing Parts
217
NOTE: If you are changing from a tower orientation to a desktop
orientation, use the tab on the back of the front panel to rotate the Dell
badge, as desired.
6 Replace the front panel (see "Replacing the Front Panel" on page 261).
7 Replace the computer cover (see "Replacing the Computer Cover" on
page 262).
1 drive release latch 2 drive panel
3 drive panel tabs
2
1
3