Speaker "no audio devise installed" but nothing has changed and my connections are secure.

"No audio output device  is installed" appears when I click on speaker on lower right of the screen. Nothing has changed on the computer. I have always had the speakers plugged into the right place, the speakers are plugged into the wall but I get no sound.
Thanks.

Can you list make and model number of pc and OS used? See if you can get to device manager and see if sound driver has   been disabled . If it has there will be a red x or yellow exclamation point on driver. Right click on driver and enable.

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