samsung SGH C300 seized .up how to fix it?

Hello , my samsung C300 slider cell phone suddenly gave it up. I mean it doesnt work with full battery- dark screen , no buttons or screen light comes up when pressing on?off button.It only lites up the buttons when I plug in the charger but still screen is dark.- totally dead As if these two parts are not
connected .What may by the issue , some cold fuse ??