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I was loading midi files with the editor and everything was working fine. After I was finished I turned off the AN1x and restart. The power came on but the screen stays stuck reading (Yamaha 1997). I have restarted it several times and it is still stuck. I tried to perform a factory reset twice by holding down 7,8,9, at the same time while powering up and it is still stuck. I'm at a lose. Can anyone help? Josh