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mmmhh, can not tell you, but seems to be a comuter error because of power issues. I had something similar with my Canon in the past.
take teh batter y out, wait 10 secainds and then put it in again. Batterie has to be charged 100%. make sure teh battery is compatibel with the ND. And check also with teh power cord for the ND without batteries in it.