Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide the right answer to your question.
MacBook Air is not listed as being necessarily compatible with HDMI usage. Or, you may need a differing adapter... MacBooks' outputs are not standardized to being identical, but rather must be approached on a one-by-one basis, according to the individual aspects.
Where is the port on your Apple Air 2016, that you call the USB/HDMI connector, please?
Or, are you using a USB port on the Apple Air 2016, to go through a USB-to-HDMI adapter cable, to an HDMI input on a monitor? That may simply not work, until the USB is configured to produce video output (there's no reason for a USB port to produce video output per se, until it is specifically configured to do so, you see.)
Are you using the USB 3 to HDMI adapter cable with this USB/HDMI connector on the Apple Air 2016 ?
Please give me more details, and I will try to advise you through to a good solution.
That clears up what is going on. Or, what you are trying to do with what resources.
But I need to ask: Is the USB port you are trying to use, a 'square' or rectangular USB port, or is it a USB-C port (which is oval, oblong, rounded) ?
OK, thanks for the photo, and for clearing that up.
I assume you mean the USB port that is unoccupied by any cable, in the picture you posted, not the Firewire port that has a cable in it in the picture.
Is your model the 13 inch, or one of the 15 inch, MacBook Air models?
Yes, you say what I am suspecting (though I have yet to look up the specific Mac Air you have.) The USB ports, if not USB-C, may not support video output.