Hello, I purchased an iMac a few months ago (one of the stainless steel ones) and have noticed recently that the screen is not as crisp as it use to be. I can also notice that the screen shifts from left to right a tiny bit (maybe a 2 or 3 pixels) when I move my mouse from left to right. The screen will sometimes also come in focus in certain areas depending on where the mouse is. Has anyone out there noticed a similar problem? Know a remedy by any chance?