New iMac 27" 3.06GHz Core 2 Duo - Grey bar and yellowing on screen.

Are the problems with the 27" screen only affecting the i5 and i7 versions.
Is anyone experiencing similar (or different) issues with the *Core 2 Duo* versions?
I have faint yellowing in the bottom 3" of the screen, but more worrying is the faint grey shadow bar that runs across the whole screen about 2" up from the bottom which seems to be getting more pronounced.
Does anyone else have this or do I just have a rogue, so far no flickering, no tearing, no shut off?

Hi,
I have that faint shadow bar as well 2 inches from the bottom. I cant figure out what causes it. It runs all across the whole thing.

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