My bf has a 2.0ghz stock white macbook and it has the screen flickering issue and it seems to be getting worse and worse. It seems to happen randomly, and when it happens, it seems like the brightness is flashing up and down. It's almost new, and has no other issues. We've tried everything and since it's his main computer, he can't really be without it (he's a journalist). I really think it's a software issue, because someone reported that it doesn't happen when running windows. According to the apple support discussions, it seems like a common issue... any ideas anyone? we're getting really desperate.