Thanks for the advice. That, however, did not work. I am still getting the same issues.
Something to try--open your device manager and click on the triangle by "Sound, video, and game controllers" to open its list. Find "AMD High Definition Audio Device," right-click on it and select "Disable," and answer the "Do you really want to disable it?" query with "Yes."
Then reboot, and see if your sound is back.