Dell OptiPlex 3020M Owner's Manual page 12

2. Perform the following steps as shown in the illustration:
a) Slide the computer into the slot [1].
b) Tighten the screw to secure the computer to the optical drive console [2].
3. Perform the following steps as shown in the illustration:
a) Cut the strap of the power adapter cable [1].
b) Slide and insert the power adapter into the slot [2].
c) Route the cable through the notch to secure it [3].
12 Installing the Accessories