Dell OptiPlex GX60 - Manual (Page 127)

10. Update your configuration information by setting the appropriate Drive option (0 or 1) under Drives: Secondary to Auto. See " Drive Configuration " for
more information.
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.
11. Reset the chassis intrusion detector by changing Chassis Intrusion to Enabled or Enabled-Silent.
12. 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.