Dell OptiPlex Gxi - Manual (Page 66)

Expansion-Card Cage Removal (Mini Tower Chassis): OptiPlex GXi
1. Rotate the lever toward the back of the computer until it stops in the upright position.
2. Slide the expansion-card cage out of the computer..
To replace an expansion-card cage, align the tabs on the left and right sides of the expansion-card cage with the slots on the back and bottom of the chassis. With the
securing lever in its extended position, slide the expansion-card cage into place.