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I charged my Acer Iconia Tab B1-A71 for 7 hours. I used it for about 30 minutes then I stopped for awhile. When I used it again, the screen is black. I don't know if it is turned off. I pressed the power button but won't turn on. I also tried pressing it for 1 minute but no luck. Any help please? I just got this tab 2 days ago.