When I first go my kindle global I had similar problems. In my case the cause of it was the fact that I loaded 40 books on the device, and the battery quickly deleted itself. Turns out the kindle indexes the books so you can search them and that's a power intensive task. Did you load books on it?
Check the search option on the kindle, search for gibberish like "abasbas", if it says there are "items not indexed" that's your problem.
I hope this helps.
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