Electrical buzz from mac pro

Hi,
Since I had my mac pro 2.66, I hear a high frequency electrical noise coming from back of the case.. It makes this sound for a short time of period when I turn on the computer then it goes away ( usually ). But sometimes it starts while working and doesn't end. I feel like it is something with the power unit inside the case.. For example right now I have plugged in my iphone and it started..
has anyone else experienced the same issue ?
tks

I came to this thread because I just (as in two minutes ago) had this problem and looked it up on Google. I have an aluminum unibody Macbook (bought during the brief period before they decided that unibody = Pro), and got a disturbing high-pitched squeal from my MagSafe socket when the power cord was connected. Whenever it was disconnected, the squeal went away.
I know this sounds incredibly stupid and NES-like, but I suspected something (dust? a hair?) might have been caught on the contact point and blew into the MagSafe socket and connecting portion of the power cable, and plugged it back in. The squeal hasn't returned. I don't know much about power supplies or electricity, so maybe the cause I'm suggesting is impossible, but it's worth a try.

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Electrical buzz from mac pro

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