Any solution to DVI noise via Headphone out?

Have posted before but I have a new i7 Macbook Pro 8GB running fine.. and I want to use the Analog/Headphone out to 2 x phono left/right into a USB Soundcard.
This is fine for recording loops from the Macbook to another editing computer, and the levels were way down at -90.0 which is almost silence.
I now have a DVI adaptor (apple) from the Macbook Pro to a DVI Dell Monitor fine, and now I have terrible buzzing, earth hum, noise!
This obviosuly ruins the recording process as I need my 2nd Monitor hooked up to the MBP. After googling this problem, it seems many many users have this same annoying problem and Apple still produce laptops with the noisy analog out?!
Is there any cure for this?
I tried to use the headphone out as Digital SPDIF out which is silent, but I can't monitor in the same way via the USB soundcard on the other machine, so that makes that tiresome and awkward. I even bit the bullet and bought a good 'ground loop isolator' to put between the Macbook output lead and the input to the soundcard lead, and that still makes no difference?
It seems to be the DVI port powering another monitor that causes this. Is there a simple solution to stop the noise?
Help!

I am not familiar with the Bumper unit, it seems very low priced, but it would be hard to believe it does not use the standard solution - a transformer, even an inexpensive one.
In the states, I have used a Radio Shack unit for this problem as an inexpensive solution which appears similar to this Maplin device:
http://www.maplin.co.uk/ground-loop-isolator-33172
The gold standard device is probably the Jensen like this:
http://www.jensen-transformers.com/ci2rr.html
but it's more like $300USD.
You may have other problems, and it would be interesting if the Apple Store can solve this for you. Otherwise, I would suggest trying the Maplin unit, and return it if it is no better than the Bumper.

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OK, It is very easy to reproduce the problem, just follow this steps:
(1) Insert any headphones to iMac.
(2) Do NOT play any iTunes or any application with sound.
(3) Now, set volume with the volume control keys on your keyboard, set it to the MAX.
(4) You can keep pressing on the increase volume key and every time you hit the key you should hear a sound.
Just as when the sound stop, you will hear a high pitch. Keep repeat step 4 and wait a while, then occasionally you will hear a high pitch sound that will last to longer than 30 seconds. The high pitch will be even easier to reproduce if you alternate before decreasing volume and increase volume by 1 level, each time, wait and you will hear the high pitch too.
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BTW, I turned OFF WIFI, Bluetooth, removed all USB devices except keyboard and mouse, adjust monitor brightness, they have no effect on the high pitch, it is still there!
I am going to call the Apple Care tomorrow. Will keep you guys posted.
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Any solution to DVI noise via Headphone out?

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