I've got a 13" MacBook. I was working on Illustrator and listening to music. I completely quit all programs and ejected the CD I had been listening to. Then I shut down my MacBook. An hour later I returned to the computer and pushed the power button. The display comes on, however the computer is not making it's usual bwaaaaah ding noise. The display starts as white and then slowly bars of color come forward. They are very faint and then the bars becomes rather opaque. I can't use the mouse and no icons appear on the desktop, just these colored bars. Any ideas or suggestions? My roommate tried removing the battery and replacing it but this did nothing.