How did you restart it? And what does "mouse flashes" mean? Try again - long press the power button to turn it off, after switching off, press the power button normally to turn it on. If that doesn't help, let the notebook cool down and try again. If even that doesn't help: - check if there is no display image (shine on it), in which case there is no backlight - if there is no image, left monitor, or graphics (or cable ...) Anyway, it's for service. For now, if you have, try connecting an external monitor (at least that's how you know if the graphics or display has gone) ...