As much as I love my new iMac, I have just noticed that the screen tilts down to one side. I have measured it and it and on the right side of the screen the gap between the desk and the bottom of the screen is 8.5cm and the left 8.2cm. I don't know if this is an issue where I should consider returning it but it is a little annoying as i have noticed it. Anyone else have this screen problem?