IBM System x3400 M3 Types 7378 Installation And User Manual page 76

7. Press the adapter firmly into the expansion slot, lower the adapter-retention
8. Connect any needed cables to the adapter.
If you have other devices to install or remove, do so now. Otherwise, go to
"Completing the installation" on page 98.
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IBM System x3400 M3 Types 7378 and 7379: Installation and User's Guide
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.