I assume as you have tried it in safe mode the screen works during boot up?
it may have switched its self over to using an external display (mine does it sometimes if I shut the lid during boot up)
if you loook at your f keys along the top of the keyboard one of them should have markings in a different colour that will either be a little pic of two screens or will say something like LCD/CRT on it (I believe from memory it's F5 on toshibas) try holding down your fn key and pressing this to see if it will switch the screen back on.