Audi Concert - Single DIN

[mccrum]

Hi, I have the standard single DIN Audi Concert in my 2005 A3 1.9 TDI.

I turned the car on yesterday and noticed there was no sound coming from the stereo. The stereo switches on fine and seems to function fine, can flick through CD tracks and radio stations, just no sound coming from any of the speakers.

Any ideas why this is happening?

Thanks.