I had a similar problem in the past. I have the center console out to fix a deck error on the cd changer. When I put it back in, the premium sound flash screen would show, then shutdown.....nothing. The volume control would show the empty bar, that was all.
I pulled out the console again and saw a tight curve on the optical fiber wire. This must have got tighter when the console was fixed in place, and kincked the wire.
You should try this first, just to see. Check if the console works when pulled out and wires are not compressed in.
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