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On my Win 8.1 computer, sometimes when I unplug my speakers, or plug them into the audio jack, the audio will stop working. When I test the playback device, Windows shows an error like "Failed to play test tone" (I don't remember the exact wording). Disabling and re-enabling the device doesn't make a difference. I usually have to reboot. Maybe sometimes it fixes itself after a while; not sure.
But today, I tried this, and it worked:
open a command window using "Run as Administrator"
then enter commands:
net stop audiosrv
net start audiosrv
But today, I tried this, and it worked:
open a command window using "Run as Administrator"
then enter commands:
net stop audiosrv
net start audiosrv