soundcard hum

[mono]

there is a nasty noise comming from my soundcard. sounds like this

http://www.file-upload.net/download-915820/nastynoise.mp3.html

soundcard is pci, slot beneath the network interface.
stereo out cinch, hooked up to my mixer.

its not the cables, its not the mixer channel

any ideas ?

 

[mono]

it was the cables

 

[eldiablo]

lol classic