This morning I got a picture of that horrible green devilish looking Samsung imogie saying "upgrading, do not turn off" or something to that affect. After hours of this, I finally tried to turn it off. There was no circle or bar to indicate anything was actually happening but it was unresponsive and stayed on anyway. Later, I saw it flashing in a poltergeist manner and then it went black. It seems dead and won't turn on now. What happened? I will miss it. I have a new iPad but prefer the old Samsung, which was my first tablet.