Dell Precision T3400 (Late 2007) - Manual (Page 215)

Adding and Replacing Parts
215
NOTE: If you are changing from a desktop orientation to a tower
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).
Removing the Drive Panel (Desktop Computer)
CAUTION:
Before you begin any of the procedures in this section, follow the
safety instructions in the Product Information Guide.
1 Follow the procedures in "Before You Begin" on page 143.
2 Remove the computer cover (see "Removing the Computer Cover" on
page 145).
3 Remove the front panel (see "Removing the Front Panel" on page 154).
4 Grasp the drive release latch and slide it towards the base of the computer
until the drive panel snaps open.
5 Pivot the drive panel outward, and lift to remove it.