My tablet is not turning on with all buttons

My tablet is not turning on it had turned off i tried so many times holding the power button for a long time and pressing them with volume buttons but it isnot turning onn and when i connect to the charger it just shows red empt battery with indicator and i have charged it alot like 5 6 hours but still its not giving respond to any buttons but just connected to a charger and show the symbol.HELP PLEASE!