Dell OptiPlex E1 Reference And Installation Manual page 107

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NOTE: After you remove and replace the cover, the chassis intrusion detector will
cause the following message to be displayed at the next system start-up:
ALERT! Cover was previously removed.
See Chapter 2, "Using the System Setup Program," for instructions.
NOTE: If a setup password has been assigned by someone else, contact your
network administrator for information on resetting the chassis intrusion detector.
See Chapter 2, "Using the System Setup Program," for information on running
the System Setup program.
Enter the correct time and date through the System Setup program's System
Time and System Date categories. Also, use the copy you made in step 1 to
restore the correct settings for other system configuration information. Then exit
the System Setup program.
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Installing System Board Options
BATTERY
socket
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