Earlier this week I received my new iMac 27" and immediately saw this 'Bo' cosmetic mark on my display. It is only visible on a dark background but would you guys exchange this? I also have slight backlight bleeding, yellow tint, and slow Fusion write speeds as well. The picture is upside down and I can't remove this with any cleaning cloths/materials, since it is engraved behind the front panel. Also, the mark is nearly dead center middle to the right, making it unbearable.