Audio MIDI Setup Not Working on Mac: Troubleshooting
What to check when Audio MIDI Setup is not working on Mac, including device visibility, configuration steps, and where to go next.
What the issue usually means
When Audio MIDI Setup is not working on a Mac, the most practical first answer is that the app may not be showing the device you expected, the device may be connected but not selected, or macOS may not have registered it as an audio device. This is separate from a webcam or microphone being unavailable in a specific app. Audio MIDI Setup is a built-in macOS utility for viewing and configuring audio devices and MIDI devices; it is not the place where individual apps request microphone permission.
Open Audio MIDI Setup
In macOS, Audio MIDI Setup can normally be opened from the Utilities folder inside Applications. It can also be opened using Spotlight by typing Audio MIDI Setup. If the app will not open, crashes, or opens with an empty or unexpected window, that is not evidence that a connected microphone or interface is faulty.
Check the Audio Devices window
In the Audio Devices section, confirm whether the expected microphone, headset, interface, or built-in input appears in the list. A device that is absent from this window may be disconnected, powered off, on a port that macOS cannot see, or not compatible as an audio input for this Mac. A device that appears but is not working elsewhere may simply not be selected as the input.
Distinguish device detection from app access
Audio MIDI Setup reports the devices macOS has recognized as audio or MIDI hardware. It does not show whether a browser or video-calling app has permission to use the microphone or camera. If the microphone is visible in Audio MIDI Setup but silent in an app, the next practical area to check is that app's input selection and the macOS microphone permission for that app.
When no evidence is available
The supplied information does not include a documented cause or verified fix ranking for a specific Mac model or macOS version. Without reproducing the exact failure on the affected Mac, there is not enough evidence to state that one setting, cable, driver, or reset will resolve the issue in every case. A reasonable next step is to compare the device list in Audio MIDI Setup with the physical connection and power state of the device.