I have a problem. My Calculator(fx cg20) is crashed und doesn't turn on(always black screen)

bevor it had crashed, i have got an error(it was just about System ERROR
REBOOT : [EXIT]
INITIALIZE : [EXE] ....) i have pressed exit.

what can i do?
I am not familiar with the Casio calculators, but it seems that many other people have experienced a similar problem. Maybe some of the advice from this topic will be useful. If you are unable to get the calculator working yourself, I would recommend contacting Casio support, which may be able to repair/replace your calculator if it is still under warranty.
  
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