Dell OptiPlex GX60 - Manual (Page 153)

computer start-up:
ALERT! Cover was previously removed.
12. Reset the chassis intrusion detector by changing Chassis Intrusion to Enabled or Enabled-Silent.
13. Verify that your computer works correctly by running the Dell Diagnostics .
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NOTE: If a setup password has been assigned by someone else, contact your network administrator for information on resetting the chassis intrusion
detector.