IBM x3500 - System - 7977 User Manual page 40

6. If you are installing a full-length adapter, remove the blue adapter guide (if any)
7. Press the adapter firmly into the expansion slot, lower the adapter-retention
8. Connect any needed cables to the adapter.
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IBM System x3500 Type 7977: User's Guide
Retention clip
Rear adapter
retention bracket
Adapter
Front adapter
retention bracket
from the end of the adapter; then, lift the adapter-retention clip on the
adapter-support bracket. Otherwise, continue with the next step.
Adapter guide
latch, and make sure that the latch is in the closed position.
Attention: Incomplete insertion might cause damage to the system board or
the adapter.