On my end, I had to simply plug it to a USB source. Reseting the device did not work. After plugging it to a power source, the sound came back.
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If your UE Boom speaker is not making any sound, see the [https://www.ifixit.com/Wiki/UE_Boom_Is_Not_Producing_Sound|UE Boom Is Not Producing Sound problem page] for possible causes and solutions.
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On my end, I had to simply plug it into a USB source. Resetting the device did not work. After plugging it into a power source, the sound came back.