iMac 21.5" Late '09 screen flickering...

in Current Mac Hardware edited January 2014
Hi all, so I got my new iMac (the base model w/ NVIDIA 9400M) and I'm fairly happy with it. However, I've noticed that when I dim the screen all the way down, the screen starts to flicker just a little bit. Admittedly, it took me a while before I noticed it at all, but now that I know it's know how it goes.

Has anyone ever encountered this issue? Is there a software fix, such as a driver from NVIDIA? If I exchanged it for another iMac with the ATI Radeon 4670 card, would I likely have better graphics that would not cause things like the flickering issue that I have?

Thanks everyone!
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