Audio dropped out from thunderbolt cable to hdmi to monitor speakers

Audio was working fine from my Asus ve247 and my xbox plays it fine via hdmi so I know the monitor is still good. So this seems to have happened after an update.
I would like to know if there is anything I can do to restore the opportunity.

When something similar happened to me, I just restarted the Mac, then went to Sys Prefs >> Sound >> Output and all I had to do was choose HDMI. It was right there in the speakers list after the restart (with cable connected). Worked fine then. Did you try restarting with the hardware attached?
--romy

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