1994 Mercedes SL320 Roadster... Radio - turns on and lights up but no sound

n/a
This started out as an intermitent problem....but now just doesn't work at all.
We have a SL320 Roadster and the radio turns on (everything lights up) but no sound....no sound from CD player & weather channel as well.
The power antenna does not go up and that's a sure sign that the radio won't make any sound.
It doesn't seem to be sending a signal from the radio to the powe antenna & amp in the trunk.
The only thing we have done so far is check to make sure all connections are intact...which they are.
Any ideas?
(we have a friend with the exact same car and he is having the same problem)

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