Ax80 will boot after a random number of cycling on and off. Sometimes the keys will trigger a sound… although distorted sounding… sometimes the keys dont work but midi in always triggers. I would say 15 on and offs to get it to actually boot up and displays light up… whrn it doesnt come on i get garbled output on 7 segment displays and nothing on bar graph displays. The 1 out of 15 or 20 times, it boots up to show first preset… everything seems to work… except the distorted sound.
Im amazed that no one knows anything about this issue.
Take it to a tech, could be RAM or reset circuit only working intermittently. What part of the world are you in ?