Dell OptiPlex GX400 - Manual (Page 16)

d. Lift the cover away from the chassis.
e. Turn the computer on its right side before you begin working inside the chassis.
Replacing the Computer Cover
1. Check all cable connections and fold cables out of the way so that they do not catch on the computer cover. Ensure that cables are not routed over the
drive cage—they will prevent the cover from closing properly.
2. Ensure that no tools or extra parts (including screws) are left inside the computer chassis.
3. Replace the computer cover.
Perform the following steps:
a. Hold the cover at a slight angle as shown in the following figure. While aligning the top of the cover with the top of the chassis, insert the three
hooks on the cover into the three recessed slots on the computer chassis.
Replacing the Computer Cover
b. Rotate the cover downward toward the bottom of the chassis. With both hands, press against the bottom edge of the cover to ensure that the
securing hooks at the bottom of the cover click into place.
c. Slide the two parts of the padlock ring together to lock the cover release mechanism.