Has anybody ever come accross this before? I'll be in the middle of something and my screen, from the apple menu, will start to slowly was out to nothing but white. I can't seem to find anything that is causing it. The headache afterwards is getting it to startup again. Once you see the apple and it goes to the blue screen where the log in screen is, it stays blue and won't log in. Anyone have any ideas as to what my be causing this?