Dell OptiPlex SX280 - Manual (Page 25)

2. When the blue DELL™ logo appears, press <F2> immediately.
If you wait too long and the operating system logo appears, continue to wait until you see the Microsoft® Windows® desktop. Then shut down your
computer and try again.
3. Press the down-arrow keys to move to the Security option in system setup.
4. Press <Enter> to expand the Security menu.
5. Press the down-arrow key to move to the Chassis Intrusion setting.
6. Press <Enter> to focus on the options frame.
7. Press the side-arrow keys to select an option setting.
8. Press <Enter> to return to the Security menu.
9. Press <Esc> to access the exit setup menu.
10. Press the side-arrow keys and select the Save/Exit option.
11. Press <Enter> to save your changes and exit setup.
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