Thsi might sound a little crazy but I just upgraded from my Imac 24 dual core to an Imac 27 I5. I did the upgrade about a week ago and ever since then my eyes are freaking killing me. I know the screen is 3 inches larger but wow, can that make that much of a differnece on my eyes. I tried darkening the screen a little but I wonder if I should return this 27 for an I5 or I7 24 Imac? Any thoughts? Or aby of you experiencing the same issues?