Dell OptiPlex 5055 Ryzen APU Tower Owner's Manual page 52

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 align with the slots on the
chassis, and the screw holes on the system board align with the standoffs on the computer (1).
3. Replace the screws (6+/-1) to secure the system board to the computer.
4. Route all the cables through the routing clips.
5. Align the cables with the pins on connectors on the system board and connect the following cables to the system board:
a. intrusion switch
b. system fan
c. power distribution for optical drive and hard drive
d. PSU (2 cables)
e. optical dive and hard drive cables (4 cables)
f. speaker
g. power switch
6. Secure the intrusion switch cable to the system fan with an adhesive tape.
7. Connect the system fan cable to the connector on the system board.
8. Close the front panel door.
9. Install the:
52 Field service information