Dell OptiPlex GX280 - Manual (Page 272)

9. Reset the chassis intrusion detector by changing Chassis Intrusion to On or On-Silent.
NOTE: If an admin password has been assigned by someone else, contact your network administrator for information
on resetting the chassis intrusion detector.
Removing a Serial Port Adapter
1. Follow the procedures in " Before You Begin ."
2. Gently push the release tab on the card retention lever.
3. Disconnect the cable that connects the adapter to the system board.
4. Grasp the serial port adapter bracket by its top corners, and ease it out of its connector.
5. Close the computer cover, reconnect the computer and devices to electrical outlets, and turn them on.
After you open and close the cover, the chassis intrusion detector, if installed and enabled, causes the following
message to appear on the screen at the next computer start-up:
ALERT! Cover was previously removed.
6. Reset the chassis intrusion detector by changing Chassis Intrusion to On or On-Silent.
NOTE: If an admin password has been assigned by someone else, contact your network administrator for information
on resetting the chassis intrusion detector.
Installing a Serial Port Adapter in the Card Cage
1. Follow the procedures in " Before You Begin ."
2. If applicable, remove the card installed in the PC13 connector on the system board.
3. Remove the card cage:
a. Check any cables connected to cards through the back-panel openings. Disconnect any cables that will not reach
the card cage once they are removed from the computer.
b. Gently pull on the handle and lift the card cage up and away from the computer.