Dell Precision 330 - Manual (Page 13)

the cover into the three recessed slots on the computer chassis.
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.
Replacing the Cover (Mini Tower Chassis)
c. Slide the two parts of the padlock ring together to lock the cover release mechanism.
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