Some years ago, an earlier version of roon was obviously installed on the Mac Mini. There are some folders from this time that cannot be erased.
One of them is called null.exe which contains a lot of other folders, if opened holding ALT.
If I start Roon on the Mini from the Dock, there is a small black point flashing below the roon symbol, as if the program would start, but it does not.
It is possible that roon server was installed, but the program has been erased partially. Now roon server is running on the NAS.
The problem with Roon/Qobuz on the Powerbook Pro has been resolved (by itself) meanwhile. Roon is running on the NAS, Powerbook works well as a client, together with Qobuz. (i saw in other threads this was a recent European problem.)
roon client cannot be started on the MacMini.
Remaining files cannot be erased.
When I come home on weekend, I try to make a video.
Ok, I gave up, bought an i7 Mini Mac, installed Bootcamp windows and moved the core there.
Now things are working, as far as I can see.
I am going to use the “old” Mac Mini in a different location and will report if it works there.
Also the old Mac Mini (2009) is now working properly.
I reformatted and reinstalled Mac OS.
Connected the Mini to the Iphone 7 via USB (tethered Ethernet)
ut my database of music on two 512 MByte USB Sticks
(there are 5 USB slots on this Mac Mini).
As DA converter I use a HERON converter via USB.
Then I started Roon, entered Tidal Password.
Together with Tidal a full experience of Music is now possible!