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Run mmsys.cpl if you get no audible output in a Blackboard IM call on your PC

  1. Problem: Blackboard IM (4.5.3), in its call window , gives you audio output volume meters image, but no actual audio output.
  2. Reason: Blackboard IM seems to have its on in-built idea which device to output audio to, even if you have no actual speakers plugged in to hear, and it is rather difficult to dissuade.
  3. Solution:
    1. Start / Run /”mmsys.cpl”, “OK”: Do the volume meters in there indicate that Blackboard IM outputs to another but your expected speaker (even if the other device is not the default)?
    2. imageimage
    3. Right-click on the other speaker device and Disable it.
    4. Also make sure to restart Blackboard IM. The built-in startup / dial tones will tell you immediately whether audio output works now