Uneven brightness/contrast with new iMac 20" display

Yesterday I rec'd a new Core 2 Duo 20" iMac and there is a major issue with the screen. At the bottom, its contrast and brightness are fine, but at the top it has gradually lost its brightness and contrast. The menu bar looks "dingy". Is this a software (settings) issue or a defective LCD? My iMac G5 20" does not have this problem.
Thanks,
Tony

It seems I have a similar problem (http://discussions.apple.com/thread.jspa?threadID=678070&tstart=0), but I bought mi iMac online, on the Apple Store.
Should contact Apple by phone? And... then?
Thanx

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Uneven brightness/contrast with new iMac 20" display

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