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It's fixed...
I dunno what happened but I did a system restore and it came back on. Quite strange as I never messed around with any audio settings on my computer.
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I have sony STR-DE595 for 1 year now with no problems.
I have the DVD coax input coming from my computer and have had it this way the whole time absolutely no problems. Suddenly today, I see when I select "DVD" for input as I usually would...it says "unlock" for a few moments and no sound.
I've tried a few different things so far but nothing removes the "unlock" message.
Your opinions are much appreciated.