The power on error is due to failure of the main control system. It will be good to have it checked at the service as you do not have to run around for spares.
You can remove battery and card replace battery and while switching on tap the lens hood on your palms so as to disengage any dirt or mechanism being struck, causing the lens and shutter mechanism to reset .
Use some air to blow between the lens to dislodge any sand particles struck inside. If none of these works then you can think of taking consensus with the service centre.
get estimate before you decide.
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