Hi HouseHusband. I'm on SKYPE and there's a little green light ON on my speakers so they're connected but I can't find the 'button' to unmute them. Enough info?
The green light indicates they are switched on if they are separate to your computer, it isn't an indication that they are connected in any way.
Check the speaker icon in the bottom right of the task bar is not showing a red circle, if it is left click and click on the mute button to unmute the sound