Quick checks and one-minute fixes

If your MacBook microphone is not working, start with the simplest checks first. Open System Settings (or System Preferences on older macOS) → Sound → Input and confirm the correct device is selected (Internal Microphone for built-in mics). Make sure the input volume slider is up and that the input level moves when you speak.

Next, check microphone permission for the app you're using: System Settings → Privacy & Security → Microphone. If the app is not listed or permission is off, enable it and restart the app. Many problems come down to permissions rather than hardware faults.

Finally, reboot the Mac. A restart clears temporary audio driver issues and resets app access states. If you're on Intel, a PRAM/NVRAM reset can also clear audio routing problems; for M1/M2 Macs, a restart plus SMC-equivalent behavior (power off, wait, power on) is the recommended step.

Software and settings: exact places to check

macOS connects audio at three levels: system input device, app-level input selection, and privacy permissions. Open System Settings → Sound → Input to verify the system input device and observe the input level. If the level doesn't move, it's either muted, misrouted, or hardware-faulted.

Within the app (Zoom, Teams, GarageBand, OBS, etc.) check the audio preferences and override the default device only if necessary. Some apps maintain their own device selector and mute toggles that don't follow macOS system settings. Toggle the app's microphone input off and back on, then restart the app.

If the issue started after a macOS update, check for a subsequent update or a known bug notice on Apple's site. As a safe troubleshooting step, create a new user account and test the microphone there — if it works in the new account, the problem is a user-level setting or third‑party extension.

Hardware and physical checks

External factors are often overlooked: debris, case covers, or glued screen tape in aftermarket repairs can block the mic ports. Inspect the microphone holes (usually near the camera or on the keyboard edge) and gently clear dust with a soft brush or compressed air at low pressure. Avoid poking with metal objects.

Test with an external microphone or a headset with a mic. If an external mic works while the internal mic does not, you likely have a hardware failure or a software routing issue that directs input to an inactive device. If no microphone works, the problem is probably system-level or app-level.

For built-in mics that intermittently fail, run Apple Diagnostics (restart and hold D on Intel Macs; for Apple silicon, press and hold power to access diagnostics options) to check for hardware faults. If diagnostics returns a microphone-related error code, schedule a service or contact Apple Support.

Advanced troubleshooting and repairs

Resetting NVRAM/PRAM (Intel Macs): shut down, then power on and immediately hold Option+Command+P+R for about 20 seconds. This resets audio routing memory and may fix ghost routing issues. On Apple silicon Macs, a full shutdown and cold boot perform equivalent tasks because NVRAM is automatically tested and cleared during startup.

Reset SMC (only Intel): for MacBooks with non-removable batteries, shut down, press Shift+Control+Option + Power for 10 seconds, then release and turn on. SMC handles low-level hardware control including audio routing; resetting it can fix persistent input/output faults. Do not attempt SMC resets on Apple silicon devices.

If nothing else helps, check for audio extensions and daemons from third-party apps (virtual audio drivers like Soundflower, BlackHole, or audio interfaces). Disable or uninstall those drivers, reboot, and retest. Corrupt kernel extensions or audio drivers can intercept microphone input and break system audio.

Testing, verification, and preventing future issues

Use Voice Memos or QuickTime to record a short clip as a primary test. If the waveform shows activity and playback is normal, the mic works at the system level. For a secondary check, go to System Settings → Sound → Input and watch the input meter move while you speak; this isolates app and permission problems.

To prevent future problems, keep macOS and apps updated, avoid installing unsigned audio drivers, and use cases that do not cover mic holes. Periodic tests before important calls can catch issues early — set a reminder to test microphone functionality after major updates.

When documenting persistent problems or asking for help on forums, include: macOS version, Mac model (e.g., MacBook Pro (14-inch, 2021)), any external audio devices used, and the behavior of the input meter. For community troubleshooting checklists and scripts, see this practical repository demonstrating diagnostic commands and test workflows: macbook microphone not working.

Checklist: step-by-step quick fix (use this first)

• Open System Settings → Sound → Input: select Internal Microphone and raise input volume.
• Check System Settings → Privacy & Security → Microphone: enable for the app.
• Restart the app, then restart the Mac. Test in Voice Memos or QuickTime.

If the checklist fails, proceed to advanced steps: reset NVRAM/PRAM (Intel), reset SMC (Intel), remove third-party audio drivers, run Apple Diagnostics, or contact Apple Support for hardware service.

Links and resources

For step-by-step diagnostics and a curated list of terminal commands you can run to inspect audio devices, see this public troubleshooting repo: macbook microphone not working. Use those scripts only if you are comfortable with Terminal — they help trace whether the system sees the microphone and which process holds the audio device.

Official Apple resources: check the Apple Support pages for microphone troubleshooting and service options if diagnostics show hardware errors. If your Mac is under warranty or AppleCare, contact Apple Support before attempting component-level repairs.

FAQ

Why is my Mac microphone not working?

Most often it's a permissions or input-selection issue. Verify System Settings → Sound → Input, enable microphone permission for the app under Privacy & Security, and restart the app and Mac. If that fails, test with Voice Memos and external mic to isolate hardware vs software.

How do I fix MacBook mic not working after an update?

Start by rebooting, then reinstall the app if it's app-specific. Boot into Safe Mode to see if the mic works there. If the problem is widespread, check for a macOS patch; otherwise remove third-party audio drivers and reset NVRAM/PRAM (Intel) or perform a full shutdown cycle (Apple silicon).

How can I test whether my MacBook microphone is hardware-faulty?

Record in Voice Memos or QuickTime and check the input meter in System Settings → Sound → Input while speaking. If the meter shows no activity but an external microphone works, the internal mic is likely faulty. Run Apple Diagnostics for hardware codes and contact Apple Support for repair.