Dell Precision 340 - Manual (Page 5)

Replacing the Chassis Intrusion Switch
To replace the chassis intrusion switch, follow the " Removing the Chassis Intrusion Switch " procedures in reverse order.
Resetting the Chassis Intrusion Detector
1. Enter system setup by pressing <F2> during the computer's POST.
For instructions on using system setup, see the User's Guide.
2. Under the System Security tab, reset the Chassis Intrusion option by pressing the left- or right-arrow key to select Reset. Change the setting to
Enabled, Enabled-Silent, or Disabled.
3. Press <Alt><B> to restart the computer and implement your changes.
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NOTE: The default is Enabled-Silent.
NOTE: If a setup password has been assigned by someone else, contact the network administrator for information on resetting the chassis intrusion
detector.