music doesn't play by speaker

[laura300300]

When I hear music with my laptop speaker it works well - but when I stick it into my normal soundsystem (ISY - with AUX) it doesn't play since almost 1 week. When I put the aux cable out - it plays like ever. What happend?

(I have an extern sound adapter (USB) because my pawl doesn't play anymore - but Youtube or other websites work very well with the adapter! And earlier Spotify too.)