Go to Edit > Preferences > Audio Hardware > Default Input and try changing it to what your computer offers. None or No Input will probably work. The other possibilty is you've muted your audio track with the button on the left side of the timeline.
I got it! Thasnk for guiding me down the ONE obscure alley that ended in the right place to check "stereo speakers". All is good now.
"Thanks for guiding me down the ONE obscure alley..."
You are very welcome! Thank you for returning with a post of success!