Dell OptiPlex 3020M Owner's Manual page 20

7. Perform the following steps as shown in the illustration:
a. Slide and lock the chassis to the PUZ plate [1].
b. Rotate the screw in clockwise direction to secure the computer [2].
c. Flip the computer along with the monitor [3].
8. Perform the following steps as shown in the illustration:
a. Connect all the cables to the computer.
b. Slide the cover to its original position [1].
c. Tighten the screws to secure the cover to the chassis [2].
20 Installing the Accessories