Lenovo THINKSERVER 3821 - Manual (Page 194)

1 Rear adapter retention bracket
2 Adapter
3 Front adapter retention bracket
6. If you are installing a full-length adapter, remove the blue adapter guide 1 (if
any) from the end of the adapter. Otherwise, continue with the next step.
7. Press the adapter firmly into the expansion slot, lower the adapter-retention
bracket, and make sure that the bracket is in the closed position.
Attention: Incomplete insertion might cause damage to the system board or
the adapter.
8. Connect any needed cables to the adapter.
186 ThinkServer TD200x Types 3719, 3821, 3822, and 3823: Hardware Maintenance Manual