Dell PowerEdge T410 Hardware Owner's Manual page 146

7 Disconnect all the cables that are routed over the notch in the SAS
backplane board.
8 To remove the SAS backplane:
Pull the blue release pin and slide the backplane upwards.
a
Pull the backplane away from the front of the system until the
b
securing slots are free from the tabs on the chassis.
Figure 3-27. Removing and Installing the SAS Backplane
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Installing System Components
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