Hi, I recently just purchased a new macbook less than a week ago. This is also my first mac that I have ever owned. I just noticed today that when I turn the brightness all the way down, or when I go away from my computer and my screen turns black that there is a circle in the middle of my screen which I can still see what is going on in the background. Its not like its bright but you can still notice it. Has anyone else had this problem? Any suggestions on what I should do? Thank you