Dell OptiPlex Small Form Factor 7020 Owner's Manual page 39

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Figure 4. Installing the side cover
Steps
1. Align the tabs on the side cover with the slots on the chassis.
2. Slide the side cover towards the front of the computer.
3. Tighten the two captive screws that secure the side cover to the chassis.
Next steps
1. Follow the procedure in After working inside your computer.
Removing and installing side cover 39