Dell OptiPlex GX60 System User's Manual page 108

After you open and close the cover, the chassis intrusion detector, if enabled, causes the following message to appear on the screen at the next
computer start-up:
ALERT! Cover was previously removed.
9. Reset the chassis intrusion detector
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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by changing Chassis Intrusion to Enabled or Enabled-Silent.