How come my Samsung tablet 2.7.0 won’t turn on?? While it’s turned off and I have it plugged in it’s charging, but when I press the power button it turns on and it comes to the Samsung screen but then turns off and shows the charging bar… Also, when it’s not plugged in and I press the power button it doesn’t turn on. I tried pressing the power and volume buttons but that doesn’t work. And does the Samsung Tablet 2.7.0 have a battery??