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No Audio out of the microphone? Check the signal light on it is solid green - it may still be waking up. If solid red, press the circular mute toggle.
No lights on the microphone? The microphone may have been left off the dock and run out of charge. Replace it to the dock, and see what the charge lights indicate
Missing microphones? Check the lectern top for a charging dock - it may be that the room is not outfitted with these microphones. If the dock is present, check the desk and next to the PC - some people are bad at following instructions.
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