I think there are two fuses you can check in the back?
Did you try the factory reset? Hold down the F1 & CANCEL buttons, then power up the machine, release the buttons when you here a long beep.
You could try opening it up and blowing the dust off. Then unplug and re-plug all connections.
You could try opening it up and blowing the dust off. Then unplug and re-plug all connections.
Speak to plotter doctor, they will have replacement boards at a fraction of the price.