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As you've nearly tried all buttons available, I'd suggest looking inside the case. It could be something that can't be accessed from outside, maybe not even there in the units that get shipped (I mean some pads with nothing on them). I found in a Kindle 3 of mine there's a "reset to factory" button inside (I found out its purpose just pushing it); in the other ones in that place there are only the metallic pads. It could be something like that.
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