Headphone jack processor noise

Hello,
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.
Now, for several reasons, I was obliged to buy something through Sweetwater, a pro audio mail order website. However, they did not sell a cheap audio interface, and in fact the cheapest it got was around $60, way above my budget. (This is an el-cheapo setup, if you hadn't realized.) So instead I ordered the $30 Behringer UCA-202 from Amazon.
I still had to order something from Sweetwater, and after I ordered the audio interface, I got financial backing to buy hugely expensive $100 speakers. (That was sarcasm.) So, I had two pairs to choose between, one by alesis with an audio interface built in, but no line out, and one from m-audio with no interface, just RCA jacks. I was recommended the m-audios, by several people because of quality, and since I had bought the interface already, it made sense.
By some act of god, the speakers came earlier than the interface, but I had had to return my borrowed interface. So, I just hooked them up to the headphone jack of my macbook pro to pump some music through them. I was so blown away by their quality, I decided to do away with the whole nonsense of my crappy internal and display speakers. The speakers, however, did not have the processor noise issue commonly associated with MBP headphone jacks, but I thought it was my mind. It didn't matter anyway, because I still had to use the interface with my old stereo system for unrelated reasons, which I knew FOR SURE had the noise problem, right?????????
I did a side by side test of both the interface and headphone jack on both pairs of speakers involved, and then some. In all tests (and I have good hearing for these things) there was NO DIFFERENCE. I was also amazed to find my audio interface was only 16-bit, while the headphone jack was 24-bit.
So here I am, feeling totally ripped off by both behringer and apple, and here are my options:
1. Use the interface anyway (which I don't want to do because it is of lesser quality)
2. Keep the interface because as soon as I'm out $5 dollars to ship it back, I'm only getting $25 dollars from the return, and more than likely the noise will start as soon as the UPS guy picks it up.
3. Return it anyway, because there's no way in **** the processor noise will come back
4. Find that this is so strange, that I'll just return everything and hunt around in a landfill for an interface to replace the borrowed one above. :=)
I guess my real question is whether the noise will come back. I think it went away as a result of a ram upgrade & smc reset a few months ago, because I've not used the headphone jack since.

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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    this is my first post! First of all, I am sorry form my terrible english (english is not my first language).
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    Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
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