My laptop starts up and the log on screen appears but I cannot see the screen. I know it is a contradiction. The screen is black but I know the laptop has started up ok because I can barely see the log on screen in the background (mainly the white writing). It's like everything is working apart from the "bulb" that lits up the screen. Have I pressed a function button key accidently or is the light broken or has turned it self off for some reason? At the back of this laptop there is a port to plug in a monitor but nothing happens when I plug it in and I cannot go to control panel to check the settings because off course the screen is black. Any advice would be very welcome.