i came home one day to find my macbook screen cracked. there was no sign of damage on the screen or casing. however, my idiotic mother, had covered the macbook completley in a duvet while it was running. i came to find my macbook FUMING! do you lot have any idea why my screen cracked? i found it unusual that the screen had cracked...maybe it was the heat? what do you guys think? and has anyone experienced this before?