Dell OptiPlex GX1 Reference And Installation Manual page 102

See the documentation that came with the card for information about its cable
connections.
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.
Follow this procedure to remove an expansion card:
See Chapter 3, "Using the ISA Configuration Utility," for instructions.
6-6 Dell OptiPlex GX1 and GX1p Mini Tower Managed PC Systems Reference and Installation Guide