Clio 2001 pioneer stereo was working then all of a sudden there's no sound

Was wandering if anyone can help me please I have a Clio 1.2 2001 with a pioneer stereo fitted the stereo was working all of a sudden there's no sound but the stereo turns on can some one tell me how to fix this please

Clio 2001 pioneer stereo was working then all of a sudden there's no sound