Hi there. I started having the exact same problem this week with my 01 ML system. Radio sometimes comes on after 10-15 minutes. Just went to my car and started it up-no sound. Tried the nav and got the voice, but still no music. My midrange control disappeared from the sound screen and no bars or control for bass/treble or fade controls. I sure would like to know what the problem is as I had no prior indication of a problem before this happened.