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Lexicon MX400 startup issue

My Lexicon MX400 suddenly stopped working.
When I power it up the blue USB LED flashes for a couple of seconds, then the program number display quickly displays “06” and then “UP” and it hangs there. Nothing on the LCD display. I have never had anything connected to the USB port.
I tried the “reset” described in manual, by pushing “store” during power on but did not help. Any ideas?


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