Any high pitched screen noises on the 2010 iMacs?

I returned a 2009 2.8GHz i7 27" iMac because of a very loud pitched "dog whistle" noise coming from the screen inverter. It was like a very high pitched electronic squeal.

Has anybody had this experience on ANY 2010 revision iMacs (27" OR 21.5")?? I'm thinking about getting one for my work computer, and I'd like to know if they got this problem worked out yet.

I did some research on the internet and there were countless reports of other people having this same problem with their loud, high-pitched "noisy screen" squeal issues.

Thanks.

Anybody know....do any of the 2010 iMacs exhibit this problem?

OK if they still have this problem I am definitely not going to get one right now.

Again, this was a 2009 model 2.8GHz i7 Quad-Core model, I'm just wondering if ANY of the 2010s still exhibit the issue...it's a very high-pitched electronic-type whine coming from the top back of the display unit, affected when you change the screen brightness.

I have very sensitive ears and I could hear the sound even at full brightness. The sound was only un-noticeable if I turned the brightness below 20%, then the display was too dim to use.

I use a 2005 model 23" Cinema Display HD at home and it runs completely silent. I decided to buy the new (2009) 27" iMac, brought it home, booted it up, and after 10 minutes it was running extremely hot and emitting this high pitched noise that sounded like an electronic whine similar to that from an old CRT television, but very high pitched and very loud. The sound changed frequency as I adjusted the screen brightness, it was loudest from 30 - 80% brightness but still audible at full brightness, and only gone below 20% brightness. I've never had a computer display make this kind of noise. I returned the unit to the Apple Store immediately the following day and requested a full refund, which they gave me. I then did some research on the Internet about this and found that other users (BOTH 21.5" AND 27") iMac owners had experienced this noisy "dog-whistle" screen issue....this was back earlier this year before the new 2010 units were introduced...So, I'm wondering if any of the 2010 models exhibit the same issue, or if Apple has addressed this and fixed this issue for good with the new units. I wanted to buy a new iMac for my work computer to use in my office (I use a Mac Pro at home now), but I didn't want to buy one of these new 2010 units if they were still having the "Noisy Screen" issue. Again, my ears pick up on this noise very easily, it is very loud and very annoying. I get a headache from the noise in little to no time, and I couldn't bear working with an iMac having noise issues like this.