How to set correct audio output while using external screen for presentation purposes over a wire

while trying to make a presentation or simply playing a video from my MacBookAir over thunderbolt/HDMI table to large screen I am experiencing problems with audio only being played from the MBA and not the soundsystem built in to that screen (unless using a VLS application and manually selecting the audio output target).
Please help in finding how to steer audio output device  using 2in1 cable such as thunderbolt?

Hi jar9,
If you are not hearing audio over your HDMI/Thunderbolt connection, you may want to see if it is showing up as a selectable audio output as outlined in the following article:
OS X Mavericks: If you can’t hear sound from your speakers
http://support.apple.com/kb/PH13841
Regards,
- Brenden

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