IMac speaker buzz... ?

Hi all,
I apologize if this is a common issue; I've done some searching but haven't found anyone with my exact problem.
I've got a fairly old (I believe at least ten years) pair of Bose Roommate II speakers and a brand new (arrived yesterday) aluminum iMac. When I plug the speakers into the iMac, they buzz for exactly 30 seconds and then stop. Any time I play any kind of audio (including the sound effects in the OS like the feedback when you change the volume), they buzz for 30 seconds and then stop, as long as I don't play anything else. They buzz continuously if I'm listening to music or anything like that. It doesn't change volume if I change the output volume on the computer.
The speakers work flawlessly with my 2.16GHz MacBook and with both my iPods, so the speakers definitely aren't at fault here. The plug is seated firmly in the headphone jack. The fact that the time is so exact - 30 seconds on the dot - makes it seem like it's a built in thing - some internal component shutting down, maybe?
Any thoughts? Again, I'm sorry if this is a well-known issue or an obvious fix... my mom's the audiophile and she's out right now. TIA
Message was edited by: aqua*star

I have the same or similar problem. My imac is a week old and makes a humming and or buzzing sound. It's intermittent and happens especially when I go to get mail and there's no mail. It buzzed or hummed constantly today while I was on the internet. So I tried something. I disconnected my old Labtec external speakers and enabled the internal speakers. The noise stopped. I would here the humming with the volume turned all the way down on the Labtecs. Here's the crazy part. I have a voip telephone service that uses the router-so the phone is near the computer. With the Labtecs connected I picked up the phone to make a call. When I hit the on button the pitch of the hum changed on the computer. I did on and off on the phone about 10 times and the hum got higher and lower with each on and off. This is not happening with the Labtecs disconnected. Any thoughts.

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IMac speaker buzz... ?

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