Had same issue last week when I got my.
1st put the batter in, then memory card, external memory card side one, let it charge few hours, then unplugged charger then power unit on no logo black screen. Then I did same thing took battery out put it in freezzer in a bag. After while took it out put it in the unit plug in the charger no led screen now gets mad or upset at it.
Then Gave my up and return it back now I get my new one this week. This is going to be my 2nd unit.