IBM System x3550 M4 Installation And User Manual page 114

10. Fasten the two captive screws on the network adapter.
11. Reinstall the PCI riser-card assembly in PCI riser connector 2 if you have
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IBM System x3550 M4 Type 7914: Installation and User's Guide
8. Press the adapter firmly until the pin, standoffs, and retention brackets engage
the adapter. Make sure the adapter is securely seated on the connector on the
system board.
Attention: Make sure the port connectors on the adapter are aligned
properly with the chassis on the rear of the server. An incorrectly seated
adapter might cause damage to the system board or the adapter.
9. Fasten the thumbscrew on the rear side of the chassis.
removed it previously (see "Replacing a PCI riser-card assembly" on page 65).