IMac 27" strange electric buzz when it is in stop

I have a problem with my iMac 27", whent it is in stop makes a strange electric buzz.
I have reset NVRAM and SMC but it's still there.
PS sorry for my English, I'm italian

At least get the free diagnostic test which the AS & AASP's offer. This is the only way you will get confirmation of what exactly is wrong w/your iMac. You can always come back here to tell us what the problem really is & possibly get some DIY (do it yourself) instructions and/or links.
Since you reside in Italy does the following pertain to you? CLICKY CLICK---> EU-wide Consumer Laws

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Reset PRAM. http://support.apple.com/kb/PH4405
Reset SMC. http://support.apple.com/kb/HT3964
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{quote:title=Neville Mayfield wrote:}
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Neal Gillis wrote:
Hi there,
I've a bit of a bizarre issue, and I'm wondering if anyone has any suggestions...
I recently acquired a set of Mackie MR5 reference monitors, and am running them through a Tapco LINK.usb audio interface. They work great, with the exception that +anytime there's something move on the screen, they make a horrible buzzing sound+. The greater the movement, the more they buzz (or hum or whatever you want to say). Everything from moving the cursor back and forth to moving an entire window back and forth. Even if I turn the speakers down (via the audio interface), the volume of the buzzing remains the same. I booted the iMac in to Windows, and the sound is the same, so it is not an OS issue. I thought it may have been the video card making the noise (from within the computer), but the sound is definitely coming from the speakers.
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Neal,
Have you tried another mouse??? Maybe that is causing the issue...
Also, are you plugged into a 3 prong grounded outlet?

IMac 27" strange electric buzz when it is in stop

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