Lenovo THINKSERVER 3821 - Manual (Page 168)

Closing the power-supply cage
To return the power-supply cage to its closed position, do the following:
1. Rotate the power-supply cage back slightly; then, push the release tab on the
rear power-supply support bracket out of the way.
1 Power supply support bracket
2 Power supply release tab
Attention: Be sure to move the cables out of the way of the power supply
cage before you start to move the cage back into the server.
160 ThinkServer TD200x Types 3719, 3821, 3822, and 3823: Hardware Maintenance Manual