How to fix windows 7 acer laptop screen gray and lines

Hello,i change my desktop to old looking and set my power options to performance mode to make my game have more fps then i played tf2/team fortress 2 with my friend we stopped playing and i wait the game to quit after the game quit i go to my audacity to stop recording i close my audacity then my laptop sleep i turned it on then the screen sudenly turns into light gray and then turned dark gray then i shut down my laptop with my on and off botton.tommorow/today its still a dark gray screen with blue or black lines can someone help?!