Why can't I turn off my Kindle Paperwhite?

I have a kindle paper white e-reader that I received for Christmas. I am not able to turn it off.

Did you press and hold power button for about 5-7 seconds? Looks like that's the only to turn it off.

Yes of course. That is not working. I've even left "on" for over 2 weeks and the last page I read is still showing. It doesn't even  go into standby mode. 

Press and hold power button to turn it off.

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