I purchased a 27in. i5 on Black Friday with the yellow tinge issue. I exchanged it out on Dec. 6th but they told me that they can't guarantee that I will not have the problem again with another iMac, and they also told me that they will not exchange it if the same problem comes up. My new iMac still has the yellow tinge, but what will happen now? If Apple changes out the graphics cards will Apple let me return it. I am out of the two weeks from the Black Friday purchase to exchange out. Will they go by another two weeks from the day that I exchanged it, or is the 14 day policy start from the original purchase date? If they change out the graphics card will Apple let us exchange our device once the issue is corrected?