I have a Samsung galaxy tab e and I didn't use it for about 6 months, I tried to charge it and turn it back on but nothing was happening. I left it on charge for longer and tried turning it on while it was still charging but nothing happened the screen just stayed blank. I held the volume down button for 30sec, nothing, I held the volume up button for 30sec, nothing, I held the power button for 30sec, nothing, I tried to factory restart by holding down the volume up button, home button and power button for 20sec but still nothing. Can you help me?