Hi, I have a problem with radio. Antenna works, radio (a factory new Blaupunkt) switches on and all seems to be functioning, but... no sound. The loudspeakers are completely dead. If it was faulty connections there should be interference and noise, but no. All wiring should be properly connected (I did that during winter) and speakers were OK then. Are there some "hidden" junctions in the wiring loom (for example behind the dash) that could have been disconnected? I tried with another set but problem persists. Any ideas?