Screen is  darker in all four corners

Hello,
I just picked up a new 24" iMac and on all four corners of the screen it is visibly darker. Not a lot, but noticeable. Is this normal or a flaw? Anyone else experiencing this?
Thanks,
MIchael

I have noticed the same thing as well on my new 24". I have a couple 20" and 17" models (last revision) but they do not have the dark corners. Not something too bothersome, but I have noticed none-the-less.

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