colleague 2270G8 suddenly not powered on, after replacing the main board, the power is powered on, the fan starts, but does not show, because it is an all-in-one machine, it is difficult to judge whether the replacement is successful. The VGA interface of the all-in-one machine is connected to the monitor, and the display is successful, which proves the replacement of the motherboard is successful. The manufacturer said that the BIOS parameters of the motherboard should be adjusted. The first display should be changed to LVDS and the resolution should be changed to 1720*1080. Success! Make a note!