Pioneer DDJ SR no sond through speakers or Headphones

 Hi there 

I'm having trouble with my DDJ-SR not playing any sound at all through the speakers or my headphones;

At home I have a Pioneer DDJ-SR & a DDJ Wego-3. I also have a laptop(Windows 10) and a new computer that I have just installed Windows 7 as a completely new system. 

I use the DDJ-SR with Virtual dj and to date had no issues at all with either of the controllers or the set up that I have. 

But with the new PC I cant get no sound through the DDJ-SR. The new PC delivers sound when I use the Wego-3 and the DDJ-SR works fine with the laptop but for some reason the DDJ-SR will not produce any sounds when connected with the new Window 7 PC. 

When I load and play a track through the SR, all the master volume lights bounce like there is a track playing through it. But no sound through either the speakers or the headphones.

To date I have tried:

Uninstalled and reinstalled all of the files connected with Virtual dj 

Uninstalled & reinstalled all the new drivers & firmware for the DDJ-SR 

Checked that the DDj-SR is set to the default sound card for windows 7 on the "playback device". 

Changed the USB cable and tried several different ones I have spare.

Tried all the different USB sockets on the new pc 

Tried the new pc with a different controller (DDJ-Wego 3)- This worked fine

Tried a different pc (Windows 10 laptop) this also worked fine.

As you can see I've pretty much tried everything I can think of, but I'm still lost. Can anyone help ?

Thanks for any help or advice