My mac keeps going black on me and then I can't do anything on it. It'll turn on and then work for like 5 or 10 minutes and then the screen will just turn black. I tryed seeing if was just the dimmer setting and it wasn't. You can still faintly see what is on the screen as well, however not good enough to do anything on it. Sometimes when my computer turns on it'll just start from the black screen as well, it differs everytime I turn it on. Does anyone know what might be wrong with my computer and how I might be able to fix it??