My computer is/was perfect with no flaws. I have had it for 2+ months now and last week I had just finished watching a ebook(html on safari) and when I quit out of safari the screen changed to very, very yellow. When I immediately restart/quit the computer screen changes to warmish type colors gravitating towards yellow.(I wouldn't call it yellow though.) If I turn the computer off until it cools down it goes back to normal. It only happens when I read a ebook with safari I have played 12+ hours straight without anything happening and then somehow just reading a simple ebook does something to my computer screen.