I have my Blue Snowball plugged directly into a USB on the back of my Mac Mini. The light indicating power to my mic is showing. I didn't find any input devices in preferences, even the built-in mic. I did an NVRAM reset and nothing happened. I tried going into safe mode and creating another administrator account to find a sound input device, that didn't work.
Mac mini running Catalina has no sound input
audiomac-minimicrophone
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Best Answer
Apple Menu > System Preferences > Soundis the place to look for Input Sources:I've selected the Internal Microphone in the screenshot below for legibility. To use the Snowball mic (an amazing mic, BTW,) just select it. You can adjust the input volume, too.