just a though but maybe its a grouding issue..try lossening the screw a little on the card..see if that works..I really don;t know if this will help but hey might as well try.

Thanks for the tip. I'll give it a try some day. I'll also check if the cards touch in any way. Weird problem.

try moving your soundcard into another pci slot

A million thanks to both of you guys! I moved the soundcard to a PCI-slot far away from the 3d-card, and whoops - it all works again! I also left the screws a bit loose, just in case. No more background noise. Thank you again!

did this fuzz come all the time or only at certain peaks??

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it sounds like some sort of magnetic field from the onboard GFX fan affected your soundcard

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The beep sound was constant. Must have been something in the air around the graphics card, like Vizay wrote, because they didn't touch in any way, neither did anything else look suspicious in there. I'm just glad it got fixed, thanks to this forum (not so technical myself ).