You join a video call, speak, and nobody can hear you — or you open a recording app and nothing registers. A microphone that won't work can have a dozen different causes, and the fix depends on which one you have. Here's how to diagnose it quickly and get your mic working again.
Step 1: Check the Obvious First
Before diving into settings, rule out hardware. Make sure your microphone is physically connected (USB fully seated, 3.5mm jack in the mic port, not the headphone port). For wireless or Bluetooth mics, confirm pairing and battery level. If your headset has a mute button on the cable or earcup, check that it's not engaged — a hardware mute will prevent any audio signal from reaching the OS.
Step 2: Check OS-Level Permissions
Modern operating systems block microphone access for security. Both Windows and macOS require you to grant permission per-app, and a single denied permission will silently block audio for that application.
Windows 11 / 10
- Open Settings → Privacy & security → Microphone
- Make sure "Microphone access" is toggled On at the top
- Scroll down and confirm your specific app (browser, Zoom, Teams, etc.) is also toggled On
macOS
- Go to System Settings → Privacy & Security → Microphone
- Toggle on each app that needs microphone access
- Restart the app after granting access — macOS doesn't always apply the permission to a running process
Step 3: Check Browser Permissions (for Web Apps)
If your microphone isn't working in a browser-based app — video calls, voice notes, or online tools like our Microphone & Speaker Test — the browser itself may be blocking access.
- Chrome / Edge: Click the lock icon in the address bar → Microphone → Allow → reload the page
- Firefox: Click the shield or lock icon → check for a blocked microphone indicator
- Safari: Safari → Settings for This Website → Microphone → Allow
If permissions look correct, open an incognito window and test there. A browser extension (ad blocker, privacy shield) can intercept the getUserMedia API and prevent mic access.
Step 4: Select the Right Input Device
If you have multiple audio devices — headset, webcam with built-in mic, external USB mic, Bluetooth earbuds — the OS may route audio to the wrong one. Check where your system is actually sending audio:
Windows
Right-click the speaker icon in the taskbar → Sound settings → scroll to "Input" → select your microphone from the dropdown. Click "Test your microphone" to confirm it's picking up sound.
macOS
System Settings → Sound → Input → select the correct device. The input level bar should move when you speak.
Also check inside the app itself (Zoom, Teams, Discord, etc.) — they have their own audio device selectors in their settings and may be pointed at a different device than the OS default.
Step 5: Check Input Volume and Gain
A microphone that "works" but is too quiet, or produces flat silence, is often a gain issue rather than a broken mic.
- Windows: Right-click speaker icon → Sound settings → Input → Device properties → Additional device properties → Levels. Set the mic level to 80–100. Avoid "Microphone Boost" above +20 dB — it adds more noise than signal.
- macOS: System Settings → Sound → Input → Input volume slider — drag it right.
- In-app gain: Many apps (Zoom, OBS, Audacity) have their own gain or input volume controls separate from the OS setting.
Step 6: Update or Reinstall Audio Drivers
A corrupted or outdated driver can cause intermittent mic failure or complete silence. On Windows, open Device Manager, expand "Audio inputs and outputs," right-click your microphone device, and choose "Update driver." If the mic disappeared from the list entirely, try "Scan for hardware changes."
For USB microphones with their own firmware (Blue Yeti, HyperX, etc.), check the manufacturer's website for a driver or firmware update. Reinstalling the driver by uninstalling and rescanning often resolves detection issues.
Quick Diagnostic: Test Your Mic in the Browser
The fastest way to isolate whether the problem is hardware, driver, or app-specific is to test your microphone in a neutral environment. Use our online Microphone Test — it shows a live dB meter and waveform so you can immediately see whether the OS is receiving any audio signal at all. If the waveform moves when you speak, the mic and drivers are working and the problem is in the specific app. If nothing moves after granting permission, the issue is at the OS or hardware level.
Common Mic Problems at a Glance
| Symptom | Most Likely Cause | Fix |
|---|---|---|
| No audio in browser apps only | Browser permission denied | Grant mic access in browser site settings |
| No audio in one specific app | App-level OS permission off | Enable in Windows/macOS privacy settings |
| Mic works but is very quiet | Low input gain | Raise gain in OS sound settings |
| USB mic not detected | Driver or port issue | Try a different USB port; update/reinstall driver |
| Mic works in one app, not another | App has wrong device selected | Change device in app's audio settings |
| Mic worked, now silent after update | Driver conflict post-update | Roll back or reinstall audio driver |
🎤 Test your mic now: Use MyDeviceScan's free Microphone & Speaker Test to instantly see whether your browser can detect your microphone input — no install, no upload, fully private.
Frequently Asked Questions
Why is my microphone not working in Chrome?
Chrome blocks microphone access unless you explicitly grant permission. Click the lock icon in the address bar, set "Microphone" to Allow, and reload the page. If it still doesn't work, go to Chrome Settings → Privacy and security → Site Settings → Microphone and make sure the site is not blocked.
Why does my mic not working on Zoom or Teams?
Video call apps use their own audio routing. Open your app's settings, find the Microphone section, and confirm the correct device is selected. If you recently switched to a headset, the app may still point to the built-in mic. Also check that the app has microphone permission in your OS privacy settings.
Why is my mic too quiet even at 100% volume?
Low gain is the most common cause. On Windows, right-click the speaker icon → Sound settings → Input device → Device properties → Additional device properties → Levels — try boosting the level to 80–100. On Mac, go to System Settings → Sound → Input and drag the Input volume slider to the right. Also disable AGC (automatic gain control) if your mic app supports it.
Can I test my microphone online without installing software?
Yes. Use the MyDeviceScan Microphone & Speaker Test — it runs entirely in your browser using the Web Audio API. Click "Start Mic Test", grant permission, and you'll see a live dB meter and waveform. Nothing is recorded or uploaded.
Why does my microphone work in one app but not another?
Each app requests microphone permission independently. On Windows, go to Settings → Privacy → Microphone and scroll down to check that the specific app is toggled on. On Mac, check System Settings → Privacy & Security → Microphone. The OS grants access per-app, so a blanket "mic is on" doesn't mean all apps can use it.
Why is my USB microphone not being detected?
Try a different USB port. USB microphones sometimes conflict with USB hubs — plug directly into the computer. On Windows, open Device Manager and check for a yellow warning on the audio device. On Mac, open Audio MIDI Setup (in /Applications/Utilities/) to confirm the mic appears as an input device. A driver update or USB cable swap can also fix detection issues.