GT 735 - USB audio [split]

Well, no, I think i have the same problem.
Only if I plug in my headphones (via USB-integrated soundcard) I will get this cracking annoying sound... I have already tried to disable my onboard sound but it didn't work...
I disabled all those strange sound devices in the device manager in safe mode as I was told in other threads about sound problems.
I am trying to disable my onboard sound device @ BIOS but there are no options to do so.. I'm confused, maybe there is a combination of keys I need to press to get more options in BIOS?
I think it is not that phenomenal for a GAMING NOTEBOOK to be non-compatible to a GAMING HEADSET. . So if anyone has a hint or solution for this annoying sound problem, please be kind an post it into this thread.
I think it is a hardware bug between the onboard sound and my USB soundcard (it is from Sennheiser)
I'm running XP, because of the reason many sound problems were found with Vista and Sennheiser USB Soundcards as I searched @ google
I am using GT735, too.
best regards 

Hiho!
I only get the "crackling" sound through the USB soundcard.
For example:
- my headphones are connected to that ofc, but I also was used to connect my hi-fi system via cinch (http://img294.imageshack.us/i/1850dreih.jpg/ ). Then I had the crackling sound in my stereo equipment as well!
- If I used my headphones without the USB, only with its standard plugs, there wasn't any problem.
- The notebook sound was all time great, even if the USB soundcard was connected. Sound via notebook output always was normal.
Half an hour ago I had pretty good sound, no "crackling", nothing but clear sound! Then I heard another song and the crackling has begun again...
Now I need to reboot so long as my sound has no crackling again. Sometimes it is already the next reboot, but not necessarily (also had to reboot 8 times in a row, that sucks.)
I already disabled the sound devices in Device Manager in safe mode. They didn't come back (from Audio-, Video- and Gamecontroller) but the others in "Other Devices" always return. I get 2x "Audiodevice on High Definition Audio-Bus" and 1x "Modemdevice on High Definition Audio-Bus". I disabled those as well but they always return. Picture: http://img411.imageshack.us/i/devicemanagerb.jpg/
And yes, I have not installed the driver from Realtek for Sound because with it it also did this crackling so there is no need for it.

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    hi i just like to say i had a similar fault though i would be surprised if it causing yours,but you never know,my fault was my laptop lid, [9 months old] it contains the mic ,and when the lid was in a certain angle crackles could be heard worse when i had my external sound card in, it was a faulty membrane [ lid to body] easily missed by engineer because it was the same angle all the time it happened,good luck, PS you English is very good
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