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I agree with Harry that a bad book file is the likely culprit. Plug it into a wall outlet and let it alone for several hours or overnight.
Once it has a full charge, then see if it starts. Then try a restart. If that fails, I'd try hooking it up to a PC and deleting the contents of the documents folder. Then I'd do another restart, and if successful I'd do a Factory Reset, and load just a book or two to make sure everything is working properly for a few days before adding more.
If all that fails, I'd flash the firmware. This is something I've fortunately never had to do, but you can get help from others in this forum (and the developer's subforum) on how this is accomplished.
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