How do I get my Toshiba satellite screen to come on??
It may simply be that it it switched to "projector mode", where the picture is sent out to an external screen. Try pressing the "internal/external monitor" keyboard combination and see if the screen comes on. You may need to press it either once or twice to get your screen to come on.
The combo is usually [Fn] (bottom left of keyboard) and a function key in the top row, marked with a picture of a computer and another screen. It's usually F4 or F5.