Dell Precision 690 - Manual (Page 130)

2. Replace the computer cover (see Replacing the Computer Cover ).
3. Connect your computer and devices to electrical outlets, and turn them on.
Resetting the Chassis Intrusion Detector
1. Turn on (or restart) your computer.
2. When the blue DELL™ logo appears, press 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 (see
Turning Off Your Computer ).
3. Enter system setup, select the Intrusion Alert option, acknowledge the alert and then press the left- or right-arrow key to select Reset. Change the
setting to On, On-Silent, or Disabled.
4. Restart the computer to implement your changes.
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NOTICE: To connect a network cable, first plug the cable into the network port or device and then plug it into the computer.
NOTE: The default setting is On-Silent.