Problems with sound, when connected to soundsystem

Hello everyone!
I have problems when my iMac 24" is connected to my soundsystem and plasma TV. The sound comes out perfect from the iMac's jack port, but along with the sound (from a movie or song etc) is a VERY annoying wholing sound.
I have narrowed the source of this wholing sound; it comes from the iMac (although i do not know which part). When I put my ear very close to the iMac I can here the exact same wholing sound; so my soundsystem is (of course) increasing the sound, along with this wholing sound.
My question: is there a way to remove this unwanted wholing sound? I hope there is a way - thanks!

Ignoring what the sound sounds like at th moment, I'm confused. Are you saying you think the sound is coming from the machine, but not not its internal speakers, and only when you have the sound system plugged in?
And I don't understand the phrase "it's like the Jack stick is too sensitive or something".
The only moving parts in a imac are its fan and hard drive. Initially I was going to say I think it is the hard drive when you said "very high-pitched". But then you added the rest of that post.
I doubt now it's the hard drive since you say you only hear the sound with the sound system plugged in, but just in case, here's a link to a bunch of hard drive sounds. See if any of those match what you are hearing.
I guess another theory is that with the sound system plugged in the fan revs up. Not sure why it would do that though since the machine should really not have any additional load simply because you are using the line out jack. I thought I would mention it anyhow because I am running out of ideas.

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Problems with sound, when connected to soundsystem

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