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 ??
val, March 2011


done
Press Call Accept and Call Reject "soft keys" together once it is charged.

Michael Sprakes, March 2014
link Click here to see other fixes for Samsung.