Dell PRECISION 530 - Manual (Page 121)

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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.
9 Enter system setup, reset the Chassis Intrusion option as described in
your User’s Guide, and enter the current time and date. Then exit
system setup and save the information.
10 Turn off your computer and disconnect it from its electrical outlet.
Leave the computer off for at least 10 minutes.
11 Reconnect the computer to its electrical outlet and turn it on.
12 Enter system setup, and check the date and time.
13 If the time and date are still incorrect, contact Dell for technical
assistance.