Do you have an external mic or headset/mic you can try?
Hi Z, yes I bought an external mic and it works
What does your Settings>Sound>Inputs tab screen look like?
(You only attached Outputs tab screenshot in your post #9 above)
Also what does Alsamixer look like with the external mic working?
With soundcard selected (F6)
When you select "Internal Microphone - Built-in Audio", what do you get?
I assume that is the one that you have problem with.
I get nothing, equally if I select computer speakers, there is no sound
only USB mic and speakers work
Seems like your internal sound is not being detected at all. Whilst I have overcome a starnge sound problem myself using Alsamixer, I feel I am at a loss to help you.
All I can suggest is doing further websearches using your machine, sound card and Ubuntu 18.04 (for Z15) or Ubuntu 20.04 (for Z16) as search terms. That may be limited by your machine being a Imac.
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Appreciate all of your help. I feel I may reinstall mac osx then dual boot with Zorin. My current expertise is too limited for anything else.