Dell OptiPlex GX260 Series System User's Manual page 42

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. 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.
8. Reset the chassis intrusion detector by changing Chassis Intrusion to Enabled or Enabled-Silent.
NOTE: If a setup password has been assigned by someone else, contact your network administrator for
information on resetting the chassis intrusion detector.
9. Access system setup
10. Properly dispose of the old
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and restore the settings you recorded in step 1.
battery.