I just buy a new laptop Inspiron 13 7000 series 2-in-1. It comes with Windows 8.1. It happened (not sure why) that the volume control is frozen at the top-left corner screen with the 0% volume level, so I can not adjust the volume at all both on the keyboard and on the touch screen. 

What I have tried is below

- In control panel, sound, communications: when Windows detects communications activity

  Select "Do nothing" 

- uninstalled audio driver and leave it is automatically reinstalled after reboot

- uninstalled audio driver and install the audio driver downloaded from dell support

- do clean boot and uninstall-reinstall driver

It was resolved once when I tried pull off and push back the usb for the logitech wireless mouse. When the volume control got stuck on screen again, I tried this again but it does not help anymore.

Any suggestion please. Thank you.

Nuch