27" screenbuzz when decrease brightness

27" screenbuzz when decrease brightness
This only happens when HD reaches +47 degrees celcius or +116 degrees Fahrenheit.
I first noticed this when I was transfering my picturs from my network drive to the iMacs HD. This where about 50Gb of data and just before the screensaver jumps in the screen brightness gets auto ajust to a less brighter setting. This is when I first noticed the noise or electrical buzz.
Please can anyone check if they are having the same issue. Because I'de realy like to know if this is a hardware problem or maybe just a software and fan setting/threshold related issue.
Kindregards NotoriousT

I returned my i5 tonight at the local Apple Store. 4 days old. They wanted to keep it for additional diagnostics for a couple of days, I wasn't up for that.
The Genius couldn't hear the noise since the store was so noisy; I could barely hear it sitting right next next to it and knowing what it sounded like.
I told him I'd accept a replacement if I could unbox it in a quiet area and listen to it to see if it had the whine. He said they didn't have the time to help me with that, and I told him I would not chance taking another whiney iMac home with me just to be back in a few days witht he same complaint.
Seems that for $2K you could get that type of cooperation. That was a disappointment.
So we agreed to disagree, and ultimately they agreed to a refund with no restocking fee. And I will be waiting and watching these boards for indications that the 1.0 bugs are worked out of them, then perhaps make another purchase at that time...
Interestingly, as I was wandering through the store to leave, I started chatting with a salesperson who offered to help me. I explained the day's events and mentioned the whine and he lowered the brightness on one of the C2D 27" iMacs on the floor and said, "You're right, this one whines, too."
My point exactly...

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