Dell Precision 3930 Rack Service Manual page 72

Installing the system board
1 Hold the system board by its edges, and align it towards the back of the system.
2 Lower the system board into the system chassis until the connectors at the back of the system board align with the slots on the
chassis rear wall. Move the board toward the rear wall until the screw holes on the system board align with the standoffs on the
system chassis [1].
3 Secure the system board to the chassis with the nine #6 32 screws.
72 Removing and installing components