Dell OptiPlex Small Form Factor 7020 Owner's Manual page 76

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Figure 34. Installing the Intrusion switch
Steps
1. Slide the intrusion switch into the slot on the chassis.
2. Connect the intrusion-switch cable to its connector (INTRUSION) on the system board.
Next steps
1. Install the side cover.
2. Follow the procedure in After working inside your computer.
76 Removing and installing Customer Replaceable Units (CRUs)