Dell Precision 530 Service Manual page 121

NOTE: If enabled, the Chassis Intrusion option will cause the following
message to be displayed at the next computer start-up:
ALERT! Cover was previously removed.
Enter system setup, reset the Chassis Intrusion option as described in
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your User's Guide, and enter the current time and date. Then exit
system setup and save the information.
Turn off your computer and disconnect it from its electrical outlet.
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Leave the computer off for at least 10 minutes.
Reconnect the computer to its electrical outlet and turn it on.
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Enter system setup, and check the date and time.
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If the time and date are still incorrect, contact Dell for technical
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assistance.
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