Headphone Jack Background Noise When No Audio Present

I'm really getting frustrated. I have my headphones plugged directly into my iMac, and I'm hearing a low white noise sort of sound coming only from the right channel. The left is silent...like it should be. The level of the white noise is not impacted by adjusting the computer volume. Why is this happening? And how can I make it go away? Most likely, unfortunately, I may have to venture to the Apple Store.
I did try another set of headphones.
Thank you.

Dear sirs,
this is my first post! First of all, I am sorry form my terrible english (english is not my first language).
I purchased my iMac very recently. This is the first experience with Apple for me. It is nice, in general, but I am experiencing a problem with the audio out (mini-jack used as analogical out). When I connect the audio output minijack of the iMac with a cable (very good cable) to my Behringer mixer audio input, I hear a noise (like a white noise). Not continuously, only when I scroll something in a window on the screen. In general every time there is something that change on the screen, I hear this noise (on both channels).
As for BMBell1919 user the level of the noise "is not impacted by adjusting the computer volume".
I am a little bit surprised! A lot of people in the professional audio broadcasting say that Apple manufactures nice products…but if the quality of the internal sound peripheral is this one…i think Apple probably changed the quality standard of design and production.
Is there any one that have the same problem that I am experiencing? Any suggestion to solve it? Is it an hardware problem? It need service?
Thank you for your attention.
Bye.

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I understand this is a long post but I do not know how to explain it any other way.
Recently I was in the market for a display for use with FCE Digital Cinema Desktop Preview. Now, it becomes disconcerting to look at video full screen and have the audio coming from 20 degrees away. So I hooked up a half-baked way to send a copy of the audio to the line in jack of the display, and to one of those 5-year old all-in-one cd player/tape player stereoes everyone has lying around. It involves using an audio interface. (If you want instructions on how to set this up without cutting off your internal speakers, drop a line). So the audio interface I was using was borrowed just for the purpose of testing this.
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Dear sirs,
this is my first post! First of all, I am sorry form my terrible english (english is not my first language).
I purchased my iMac very recently. This is the first experience with Apple for me. It is nice, in general, but I am experiencing a problem with the audio out (mini-jack used as analogical out). When I connect the audio output minijack of the iMac with a cable (very good cable) to my Behringer mixer audio input, I hear a noise (like a white noise). Not continuously, only when I scroll something in a window on the screen. In general every time there is something that change on the screen, I hear this noise (on both channels).
As for BMBell1919 user the level of the noise "is not impacted by adjusting the computer volume".
I am a little bit surprised! A lot of people in the professional audio broadcasting say that Apple manufactures nice products…but if the quality of the internal sound peripheral is this one…i think Apple probably changed the quality standard of design and production.
Is there any one that have the same problem that I am experiencing? Any suggestion to solve it? Is it an hardware problem? It need service?
Thank you for your attention.
Bye.

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