A week ago i turned on my ibook and about 30 minutes later the display turned off. So i rebooted and the display turned off again except this time it turned within 15 minutes. So everytime i rebooted the display would turn off even faster. Now whenever I turn the ibook on, the display doesnt even turn on anymore and the fan starts running at a really speed. Occasionally the ibook will fully boot up, but then 20 minutes later the display will go black again, and all the other starts happening again. Could someone please HELP i use my ibook everyday for school.