Dell OptiPlex GX60 System User's Manual page 25

NOTICE: To connect a network cable, first plug the cable into the network wall jack, and then plug it into the computer.
6. Close the computer cover, and plug your computer and devices into electrical outlets.
7. Attach the computer stand, if it is used.
8. 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.
10. Enter system setup and restore the settings you recorded in step 1.
11. Properly dispose of the old battery.
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by changing Chassis Intrusion to Enabled or Enabled-Silent.