Now that I'm using my PS2 mouse again, I always get an error message saying that a service or device failed to load at startup. That will solve the problem, but it will mean that a mouse would not be detected if you ever need to use a serial mouse again. You've go to go the Server Manager and manually disconnect the share. They have to determine what is moving, and what is at rest. The computer seems to be on, but the screen is black.
Some laptops have a tiny mechanical switch that turns the screen off when the lid is folded down.
On the Toshibas our company uses, it's just a little spring-loaded pin that is supposed to pop up when the lid is opened. Snapping a fingernail on it will usually be enough to fix it.