Computer has no audio?

When I turned on my pc this morning it says no audio output device is installed even though my speaker is plugged-in. I right-clicked the icon and selected playback devices but it also says no audio output device is installed. How will I get my audio back? I went to device manager but I didn't saw any yellow... show more When I turned on my pc this morning it says no audio output device is installed even though my speaker is plugged-in. I right-clicked the icon and selected playback devices but it also says no audio output device is installed. How will I get my audio back? I went to device manager but I didn't saw any yellow question marks. Help please!!
Update: Oh and I went to device manager and I cant find sound,audio and game controllers tab.
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