Dell Precision Workstation 690 User Manual page 124

ALERT! Cover was previously removed.
NOTE: If the chassis intrusion switch is not detected or the cover is open the system will run all fans at maximum speed to prevent overheating.
6. Reset the chassis intrusion detector by changing Intrusion Alert to Enabled or Enabled-Silent. See
Chassis Intrusion Switch is actually essential to your computer as that it can alert you if the computer case is unexpectedly removed.
NOTE: If a setup password has been assigned by someone else, contact your network administrator for information on resetting the chassis
intrusion detector.
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Resetting the Chassis Intrusion Detector. The