Don't worry. Although not a pleasant thing to discover it is relatively a minor problem. Reformat the internal memory using Fat 16 and everything should be ok. There will be no books left but it should be usable again.
Did you turn of your BeBook fully or just lock the keypad. I suspect you fully turned of. Sometimes, if the Bebook is still writing information, such as current page, when you switch of then it can corrupt the memory. It can also happen if your battery runs very low.
EDIT
Harry is also correct. ;-)
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