Dell OptiPlex GX280 - Manual (Page 259)

a. Press the two snaps on the top of the panel insert and rotate the insert toward the front of the computer.
b. Remove the shoulder screws (3) from the old drive.
c. Insert the shoulder screws (3) into the sides of the new floppy drive and tighten.
1 drive
2 shoulder screws (3)
4. Connect the power and CD/DVD drive cables to the drive.
5. Gently slide the drive into place until you hear a click or feel the drive securely installed.
1 drive
6. Check all cable connections, and fold cables out of the way to provide airflow for the fan and cooling vents.
7. Close the computer cover.