If the volume controls on your keyboard stop working, check the Human Interface Device Access service on your computer to make sure it’s set to Automatic. 

  1. In the search box on the taskbar, type services, then select it from the results.

  2. In the Services box, find Human Interface Device Service. Make sure the status is set to Running. If it isn't running, select Start the service.

  3. Right-click (or press and hold) Human Interface Device Service, and then select Properties.

  4. On the General tab, in the Startup type area, select Automatic, and then select OK.

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