Sorry, I should’ve been more clear in my original post. The monitor has only two ports, DVI-D and VGA. Last time I checked a Mac on it was with a Studio M1 Max thru a DVI to HDMI cord; the monitor worked fine. Now, with a Mini 2018, the screen starts with a broken, flickering image that quickly turns into “snowy”.
I suspect it is the HDMI 2.0 port on Mini. The previous Mac connected were all HDMI 1.4 or older. The question is—is buying other cable or adapter the only remedy?