...
Remove the rear panel of the console.
Examine the USB cable going from the header on the computer motherboard to connector J12 on the control board.Verify that the power LED on
the console control board lights up when the console is turned on. If it doesn't light up, and you have confirmed the USB connection, replace the control board If you are able to move the RPM, Feed Override, and Max Velocity sliders with your finger or mouse, the USB daughter board will need to be replaced. (PN 39146).
Buttons don’t respond (Cycle Start, Feed Hold, LEDs, MPG)
...