Have a toshiba satellite L505 and it's screen is completely blank and will not turn on. The laptop itself is on. I can hear the fans at least. But the screen just stays blank/black. Even if it is hooked up to a projector I still can't see any desktop images. All of the ribbons and chips look as if they are in place, but I still cannot figure out the problem. I had also just replaced the power jack because it was broken. That works fine now though. I don't know if that caused it. I did see a flicker of a cursor the first time I turned it on, but the display immediately turned off. Now I don't even get a flicker.