When you press it and hold it, though, doesn't a popup come on the screen asking you if you want to power off completely or not (and you are supposed to touch "yes" to continue to power down)? My screen would not accept my "yes" touch so it couldn't power down (it stays on if the "yes" button isn't pressed within 2 seconds or so). Do you mean to continue holding the power on/off button THROUGH that message and it will go black? (if so, I think this is finally what might have happened in my case as the screen suddenly went black and I could restart it again after that).
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