TOSHIBA Satellite M105-S3004

Hello,I have a laptop TOSHIBA Satellite M105-S3004, when I start the computer, the screen goes black and crashes, but when I touch the screen in the upper left corner and keep my fingers holding it, the screen begins to work well but I can not remove my finger on it off if it does not work. I do not know what to do. I need someone to help me and tell me if I do change the screen or that, and how to do it because I need the diagram and do not know where to get it