Macbook
I have had the same problem.  A few times. shut down, light on, hot...
Today it turned black without shutting down in the middle of sending an email.  the light stayed on.  When I went to boot, the computer started, but black screen was still there.  The 'guide' tells you to put in disk 1 from installation pack.  It ate my disk.  I have a 3 yr service agreement, called them, they walked me through like 10 different steps, nothing...  they are sending me some "mail dispatch" package that I am to send my computer.  BS I'm a student taking 18 summer credits, I have 1 week left in my classes and everything I need is on that computer. F*&K!!!!!!!!!!!