The screens are notorious for going out. But before you replace the lcd hook up a monitor to it. I have replaced a screen and it is pretty easy. A replacement can be had on ebay for a good price. But there is also the LCD inverter which are a lot cheaper than a screen. Also could be a backlight. I am told a way to test those is to shine a flashlight on the screen when you have it on. Though backlights are also cheaper than a whole new screen it will require removing the lcd and soldering new backlights on them.