How to check your audio output device:
- Right-click on the Start button in the lower left corner
 - Click Run
 - Type mmsys.cpl and hit OK
 - Right-click the output device that should be default and choose "Set as default device".  Then, do it again and choose - "Set as default communication device"
- For a projector / Newline - it will typically be "Intel Display Audio" or "AMD High Definition Audio Device" or "NVIDIA High Definition Audio"
 - For a Promethean board with built-in speakers - you will want it set on "Promethean USB Audio"
 - The internal speakers on a computer are typically labeled "Realtek High Definition Audio" - most desktops that are hooked into a display should not be set to this output, but if you only have a monitor on your desktop, that is usually what you will want it set to
 
 - To verify that you have the correct output selected, you can right-click on the device and choose "Test"
 - Please note that when you hook in a new display (new monitor, new projector, etc...) - it is typically expected for that new display to become default
 
Here is a sample screen:
If you are unable to get it working after checking these settings, please put in a helpdesk ticket.