Dell OptiPlex GX280 - Manual (Page 211)

See the documentation that came with the drive for instructions on installing any software required for drive operation.
10. 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.
11. 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.
12. If the drive you just installed is the primary drive, insert a bootable medium into your boot drive.
13. Turn on the computer.
14. Enter system setup and update the appropriate Primary Drive option (0 or 1).
15. Exit system setup, and reboot the computer.
16. Partition and logically format your drive before you proceed to the next step.
For instructions, see the documentation that came with your operating system.
17. Test the hard drive by running the Dell Diagnostics .
18. Install your operating system on the hard drive.
For instructions, see the documentation that came with your operating system.
Front-Panel Inserts
If you are installing a new floppy or CD/DVD drive instead of replacing a drive, remove the front-panel inserts:
1. Facing the front of the computer, use your fingers to remove the front-panel cover.
2. Press on the inserts until they pop free of the front-panel cover.