Had an old set of bad headphones, cut off the jack, and used that jack plugged in, with the INPUT setting, and get speakers to work. And the only way I could find this was by print screening the mute sign and using google image search! A fix: after a lot of fiddling with no success, I discovered that when I plugged into the sound output with headphones and changed my sound settings to use audio port for sound INPUT, the internal speakers kick in.