So I've had my iMac for about 4 days, and was doing some retouching in photoshop last night, and on an image with a mostly white background, I noticed that there is 1 dead pixel right in the middle of the display. What should I do? Return it? Keep it since it's not particularly noticeable other than on a pure white background? I'm torn, but it was an expensive machine approaching $3,000.