My Yamaha M08 does not turn on.

My Yamaha M08 does not want to turn on.  I plug and unplug it, move a little bit the little box where the power adapter plugs and and after a while turns on Yamaha and green on the background on the display but it’s all it does.   I don’t know if is the power adapter or the little box where it plugs.   Any suggestions?

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