Dell Precision 410 Service Manual page 104

NOTE: Installing filler brackets over empty card-slot openings is necessary
to maintain Federal Communications Commission (FCC) certification of the
system. The brackets also keep dust and dirt out of your computer.
NOTE: After you remove and replace the cover, the chassis intrusion detec-
tor will cause the following message to be displayed at the next system
start-up:
ALERT! Cover was previously removed.
See Chapter 3, "Using the System Setup Program," in the User's Guide for
instructions.
NOTE: If a setup password has been assigned by someone else, contact
that person for information on resetting the chassis intrusion detector.
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