The stereo turns on but has no sound can someone tell me what might be the cause

Hello, The sounds in the vehicle play through the radia/nav unit, then the amplifier, then the speakers. If there is bad fuse for the amplifier, there will be no sound. I recommend checking the fuses first, and the fuse for the amplifier may be under the hood. Many times these are easy fixes for a technician with a multimeter and training, but as a DIY job can be daunting. If you need diagnostic help, check the link below, and look for a European or German specialist. http://repairpal.com/bmw-within-10-miles-of-los-banos-california-93635