Monitor apple replaced th one any ideas what that could of been2010

my 27" i5 2.8 ghz imac i bought in sept.2010 had dark shadows all over the monitor apple replaced the computer with a new one just a week ago any ideas what this could of been

Thanks Mike. I had a feeling that might be what it was, though you are correct, in that I won't be able to fully find the problem online. I guess I just wanted a bit of advice as I'd seen numerous problems similar to this, but none exactly the same.
I kept flicking between software and hardware as to what I believed was the problem, but the lack of consistency has me believing its hardware.
Frustrating as it's not within warranty, but we'll see if I can get some concrete information from a store.
Thanks again.

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