Dell OptiPlex 5055 Small Form Factor Owner's Manual

Installing the system board

1. Hold the system board by its edges and align it toward the back of the computer.
2. Lower the system board into the chassis until the connectors at the back of the system board.
3. Align with the slots on the chassis, and the screw holes on the system board align with the standoffs on the computer.
4. Replace the screws (12 lbs) to secure the system board to the computer.
5. Route all the cables through the routing clips.
6. Align the cables with the pins on connectors on the system board and connect the following cables to the system board:
   1. intrusion switch
   2. optical drive
   3. hard drive
   4. PSU
   5. power switch
   6. power distribution for optical drive and hard drive
7. Install the:
   1. expansion card
   2. memory module
   3. heat sink assembly
   4. SD card
   5. M.2 PCIe SSD
   6. processor
   7. cooling shroud
   8. optical drive
   9. 2.5 inch hard drive assembly
   10. front bezel
   11. cover
8. Follow the procedure in After working inside your computer.