Display anomalies with new 20" iMac

I've had my new 20" iMac for little over a week now (2.4GHz) and in the last two days the display has started to exhibit some strange behaviour. The best way of describing it would be to compare it to a mobile phone screen that adjusts the display brightness based on ambient lighting. This does not appear to be connected with the Energy Saver setting "Automatically reduce the brightness of the display before sleep". It occurs when the system has been on and in use for a little while and seems to settle down after a few minutes. Any ideas?

Having spoken with an apple customer service rep this evening, I was given the choice of repair or replacement of the new system, to which I chose a replacement (the system is two weeks old). However, they were unable to arrange this since there was a "technical fault" on the phone line trying to reach the sales support team while I was on hold (I assume they are outsourcing some call centre work to other countries, at least based on the accents). So I have to call back tomorrow to arrange my replacement. =)

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