Replaced 2 stereos for just that problem, both under warranty.
The Stereo appeared to power up, all faceplate features seemed to light but NO SOUND!

 

Thanks everyone. To those who offered suggestions, as stated in the OP, power is fine, no sound regardless of source (even CD) error code 2017. Took a ride on this beautiful 25˚ day and dropped off at dealer. Gonna have the intercom installed while there and internally wired bars off a CVO SG.