24" iMac "hummer"

Just purchased a 24" iMac , my first mac ever and I love it. I noticed right away the issue with the well discussed "hum". It is related to the brightness of the screen, when screen is set to max brightness no annoying hum, when lowered to minimum it really gets irritating. I called the tech support line and they had never heard of this issue, but would investigate so this would not happen to future customers. They told me to bring it in for service but I am not sure if it is worth it. I love the iMac, but dissapointed with this hum. Has anyone got a answer to this, what seems like a common problem?
iMac   Mac OS X (10.4.8)  

I am in the same boat, I want the 24" iMac and I read through this forum just to know about the possible problems. I guess there is no actual Mac that does not have the one or other issue. My G4 Powerbook had to be sent in after 2 months because the video board draw lines on the display. The G4 Mac Mini has the ethernet not working – well, my kids dont need it. The clambshell iBook needed the harddisc replaced two times. My 17" lamp-iMac doesn't read most of my burned DVDs. The only recent Mac that did not have any problems was my black G3 Lombard PowerBook from 1998 - its still working.
I will have to test a 24" iMac to decide. But it will be hard for me to replace my lamp iMac, I like that design so much better then the new iMac.

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    Hi i'm trying to follow your guide, I installed windows 8 on bootcamp to do it planning to remove it after the operation is done, but i get stuck at part 3: every command i give to imagex i get a pop-up ftom windws asking how do I want to open this kind of file install.wim and imagex does nothing, what do i have to do to stop those pop-ups?

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