Reply to white noise external mixer (Audio 8)

Hi,

i'm new
I have a serious problem with my Audio 8 DJ soundcard.

I have a constant white noise signal on my external mixer. I've tried every solution on this website. No result.

New PC:
Microsoft Windows 7 Professional
Intel(R) Core(TM) i7 CPU 920 @ 2.67GHz, 2668 MHz
(RAM) 8,00 GB
HP-Pavilion

The only thing I can do to solve the problem is audio Exit 8. And turning back to vinyl.
I've tried everything:
new cables, different USB port, disable unnecessary things in the bios, the latest bios, safe mode, ...

Can you help me find a solution?