Pulsing noise in headphones

I've been trying to get rid of annoying sound in my headphones for some time now, without any success. The noise is a pulsating hum... think its about 50Hz according to some sound analyzing software.
I was originally using Roccat Kave headphones through the built in audio on my P5N-T Deluxe mobo. This sound appeared immediately. The support at Roccat said it may be a driver problem and thought a new sound card may solve the problem (interference in mobo or something).
Installed a Creative PCI Express X-Fi Titanium card... sound still there!
The only solution i've found is holding the cable... not easy to do when you require two hands! But this solution, and the 50Hz signal, may imply the problem is related to grounding or some other type of interference.
Any help would be appreciated as no one i've spoken to can help.
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  1. Does anyone have any ideas at all?
  2. Did you try plugging other unit, like a speaker system? If the hum still exist.

    Try plugging your system to a different outlet location, could be your PSU or motherboard have grounding problem. Have your replace the cord? Move your audio cable away to power lines, or/and use something like the ferrite. http://www.radioshack.com/product/index.jsp?productId=2103222

    These suggestions does not guaranty to fix the problem, at least it'll decrease the interference.
  3. Thank you rexter
    the ferrite chokes worked a treat. I knew of their existence and knew what they did but never put he two together. They worked perfectly.
    Thank you again
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