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The instructor station PC sends the audio to the projector to play sound out of the speakers installed in the room.  Sometimes the settings get changed by a user or accidentally by a program.  The below steps will help you troubleshoot such issues. 

1. Right click on the speaker icon, and click Playback devices
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2. Right click one of the devices listed, and click Test
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   • Listen for the device that plays audio from the room speakers.  You might have to test multiple devices before you find the one that plays from the speakers.
3. Right click the device that plays audio from the room speakers, and click Set as Default Device
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4. Click OK to save the changes.
5. If the problem persists, restart the PC.