High Pitch Sound from iMac '11?

Hello everyone,
I purchased the mid '11 iMac model and am now hearing a high pitch sound which fluctuates when I change the screen brightness.
Is this a known problem; is it big enough of a problem that Apple will fix when still under warranty?

You shouldn't be hearing a high pitch sound. You should take the iMac in for evaluation, but first verify that you don't have another other equipment attached that might be contributing to the issue. My recommendation is to try disconnecting the iMac from any surge strips or backup power (UPS) supplies to see whether the issue still occurs. I would also disconnect any external peripherals, USB/FW devices, speakers or audio equipment that you have attached.

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I know there is a lot of forum posts on the internet about this, as I've spent about two days reading them (primarily from my iPhone as my screen sound drives me up the wall).
As some people have experienced, this is a result of changing the brightness (0% and 100% are fine, anything in between emits a high pitched whine...some people believe this is a result of the capacitors vibrating at around 15-16Hz, which would make sense).
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I am beyond my wits with this issue and not sure what to do now. I have spent nearly 20 hours setting up four separate computers only to format them to take back in a chance I am lucky enough to get one that I can dim at night time without getting a ringing sound in my ear.
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I started having this problem yesterday on my late 2009 iMac 27 inch after I changed my HDD.
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I am not sure if this will solve all the problems out there but its worth a look.
Follow this link to the ifixit guide to see what I mean (Look at Step 5)
http://www.ifixit.com/Guide/iMac+Intel+27-Inch+EMC+2309+and+2374+Hard+Drive+Repl acement/1634

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Message Edited by jbernar6 on 08-06-2009 10:43 AM
Message Edited by jbernar6 on 08-06-2009 10:44 AM
I should add, I did a very lax search of this topic, but my post also addresses other questions. Don't hate me. I understand forum etiquitte more than anyone, it's just I didn't have time. I needed quick answers bc of my school situation.
Thanks in advance,
Josh
Message Edited by jbernar6 on 08-06-2009 10:21 PM

Nobody at all can help?

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As of today, something strange has been happening.
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Robert Riedlinger wrote:
How can I get rid of this noise and still use my phantom powered mic (which sounds great otherwise)?
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Hi gscoops,
Welcome to Apple Support Communities.
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Make a recording of the sound so the next time you take it in you can let them hear it. It might be best to do a video of the unit so the sound is combined with pictures/video of the computer so they know the sound is coming from it.
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High Pitch Sound from iMac '11?

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