Dell Precision Tower 3420 Owner's Manual

Installing the system board

1. Hold the system board by its edges and angle it toward the back of the computer.
2. Lower the system board into the computer until the connectors at the back of the system board align with the slots on the back wall of the computer, and the screw holes on the system board align with the standoffs on the computer.
3. Tighten the screws that secure the system board to the computer
4. Connect the cables to the system board.
5. Install the:
   1. PCIe SSD
   2. memory moudle
   3. system fan
   4. heat sink
   5. heat sink fan cover
   6. optical drive
   7. hard drive
   8. front bezel
   9. cover
6. Follow the procedure in After Working Inside Your Computer.