Dell Precision 490 - Manual (Page 132)

4. Connect your computer and devices to electrical outlets, and turn them on.
5. 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.
6. Reset the chassis intrusion detector by changing Intrusion Alert to Enabled or Enabled-Silent. See Resetting the Chassis Intrusion Detector .
7. 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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1 computer cover
2 computer base
NOTICE: To connect a network cable, first plug the cable into the network port or device and then plug it into the computer.