Internal Interference noise on 24", 2.8Ghz iMac

Hi everyone,
I just got myself the new alu 24", 2.8 Ghz iMac a week ago (it's my first). I've been noticing a 2 second interference noise coming from what seems like the internal speaker (bottom right hand side of the screen). This happens every 3 to 4 minutes. Could this be caused from a 2.4ghz wireless phone although it's not in use? If not, any idea what it could be?
Thanks, any input is appreciated.

I got myself a new imac a few weeks ago and I have exactly the same problem, no idea what is causing it.

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http://support.apple.com/specs/imac/iMacEarly2008.html
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D.F. wrote:
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Lloyd Lathrop wrote:
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Internal Interference noise on 24", 2.8Ghz iMac

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