Lenovo C355 All-in-One - Manual (Page 62)

d. Line up the chassis and new LED panel with the front bezel, and then place it into position.
e. Secure the chassis to the front bezel with the nine screws.
f. Connect all the cables to the connectors on the motherboard.
Step 20. Reattach the heat-sink, system fan, rear I/O module, speaker system, EMI cover, middle cover,
optical drive, stand holder, foot cover and stand base.
56 Lenovo C355/C455 All-In-One ComputerHardware Maintenance Manual