IMac 20" making noise related to the brightness setting

Hi guys,
I just bought my imac 2 days ago and it has started to make noise on the night i bought it. But i figured out by tilting the mac forward for few seconds make it disappear.
Then i found out from the forum that it was the inverter and can be reduced by setting the brightness level which works in my case.
Just wondering should i concern about it and send it back to the store to get it fixed or just bear with it and solve the minor problems myself by tilting and making it goes max on the brightness setting?
Note: i found that it goes off after few minutes. Maybe it only happens at start up..
I just dont want to see this new IMac goes into surgery so soon...
"sigh"..

As a former authorized Apple service tech I agree with your findings. Thirty days ago I bought a 20" iMac (Early 2008) and the buzzing occurs when the iMac is 'cold' (ie: has been off for several hours and doing a cold bootup). Once booted up (to the login screen will do), use the F1 key to drop screen brightness a few notches (I go to 1/2 brightness) and there is the buzzing noise. Obvious. Simple. This noise was initially first noticed when the screen dimmed on its own when not using the iMac for 60-90 seconds or so.
... but once the iMac has been on for a while (say 10 minutes) and is 'warmed up' then I don't get the annoying buzzing noise when decreasing screen brightness.
... so I'd have to say the iMac's display inverter is needing to be replaced (unless it's integrated within the main display assembly module itself at which point the whole display panel needs swapping). Alternatively, this might be a power supply issue too although in my years as a technician any power supply issue (internal in the iMac's design) usually causes other goofy behaviour other than a screen brightness control problem.
So, Apple! You folks monitor these discussion boards. Can someone in the 'official channels' confirm/deny my findings here? Really Apple -- this issue is noted back to the 24" iMac design from 2006 so PLEASE tell us users that you DO have a permanent fix to this and it's being implemented at the production build level!!

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IMac 20" making noise related to the brightness setting

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