Really disappointed. Just received my 3rd 24" iMac and THERE IS STILL A GRADIENT PROBLEM. The left side is clearly brighter than the left side and there is backlight bleeding in the bottom left corner. This gradient is clearly noticeable to anyone who has never heard of the gradient problem. There is also a slight buzzing sound when I dim the screen which stops when it is on full brightness. I'm wondering if this might be more of a problem with the 2,8 Ghz iMacs. To say that I'm somewhat upset is an understatement.