Uh, Jozawun, sorry to read this. Most things one could advise you've already tried.
What else? You could try taking out the battery for a while or start it without the sd-card.
I guess your device is still updating the internal book database after you've loaded some books onto it. So if it comes back it may be good to clean the database.
I wish you that your Pocketbook will start working again soon!
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