Screen does not turn on or tablet doesn't turn om

Hi all

I Have a GT-N8000 today i worked with it some
and locked the screen.
after ye while when in press the power button the screen does not turn on
i Plugged-In the charger but no battery icon or Plug-In sound
i connected the tablet to a pc but no statement from pc for a usb device
i am very sad pls help me:(((((