Your MacBook’s microphone was working yesterday, and today nobody on the call can hear you. The good news: a dead Mac mic is a software problem far more often than a hardware one. Work through these fixes in order — most people are back on the call by step three.
First: a 30-second test to find where the problem lives
Open Voice Memos (it ships on every Mac) and record five seconds of yourself talking. Play it back.
- Voice Memos hears you → the microphone hardware is fine. Your problem is a permission or a setting in the one app that can’t hear you. Skip to Fix 2.
- Voice Memos records silence → the problem is system-wide. Start at Fix 1 and work down.
Fix 1: Check the input source and input level
Go to System Settings → Sound → Input.
- Make sure “MacBook Air Microphone” (or “MacBook Pro Microphone”) is selected — not a Bluetooth headset that’s off in a drawer, not “Display Audio,” and not a virtual device left behind by an audio app (Loopback, BlackHole, and some meeting apps install these).
- Slide the input volume up to around 75% and talk. If the level meter under the slider bounces, the mic works and macOS can hear you.
- If the meter is dead at full volume with the built-in mic selected, continue down the list.
Fix 2: Microphone permissions (the #1 culprit)
macOS blocks every app from the mic until you approve it once — and one accidental “Don’t Allow” click sticks forever.
Go to System Settings → Privacy & Security → Microphone and make sure the toggle is ON for the app that can’t hear you (Zoom, Teams, Slack, Chrome, Safari, Discord…). If the app isn’t in the list at all, quit and reopen it so it re-requests access. Toggling permission off and back on, then restarting the app, clears most stubborn cases.
Fix 3: The app itself is muted
Meeting apps keep their own input settings that override nothing but confuse everyone:
- Zoom: the mic arrow next to Mute → check the selected microphone, and untick “Mute my mic when joining.”
- Teams: Settings → Devices → Microphone.
- Discord: User Settings → Voice & Video — voice-activity sensitivity set too high acts exactly like a dead mic.
Also check the obvious: many Macs with the Touch Bar (2016–2019 Pros) and all meeting apps have a software mute that survives restarts.
Fix 4: Browser-based calls
If the mic dies only in Google Meet, browser Zoom, or a web recorder: click the icon at the left of the address bar → Site settings (Chrome) or Safari → Settings → Websites → Microphone, and set the site to Allow. Browsers keep per-site mic permissions independent of macOS.
Fix 5: Restart Core Audio
macOS runs sound through a background process called coreaudiod, and it occasionally wedges — usually after an audio app crashes or a USB interface is yanked mid-call. Open Terminal and run:
sudo killall coreaudiod
Enter your password (it types invisibly), and the process restarts itself within a couple of seconds. This one command fixes a huge share of “input meter is completely dead” cases. A plain restart of the Mac does the same job if Terminal isn’t your thing.
Fix 6 (Intel Macs only): Reset NVRAM and the SMC
On 2015–2020 Intel MacBooks, audio settings live partly in NVRAM. Shut down, then power on holding Option + Command + P + R for about 20 seconds. If the mic is still dead, an SMC reset (shut down, hold Shift + Control + Option + the power button for 10 seconds) is the next step. Apple Silicon Macs (M1 and later) do both automatically on every restart — a simple shutdown-and-reboot is the equivalent.
Still silent? It’s probably hardware
If Voice Memos records nothing after all of the above — and especially in Safe Mode or from a second user account — the microphone itself or its cable has likely failed. The common causes we see on trade-ins:
- Liquid damage. The mic openings sit in the speaker grille / side vents, a direct path for coffee and water. A mic that died right after a spill is not a settings problem — see our spilled-liquid triage guide for what to do in the first hour.
- Debris in the mic ports. The holes are tiny and clog with lint and dust. A gentle pass with a dry soft brush (never compressed air at close range, never a pin) sometimes revives a muffled mic.
- Logic-board failure. The mic array connects through the board, so a board-level fault can take out the mic alone or the mic and speakers together. If speakers are also crackling or dead, read our speaker troubleshooting guide and our logic-board failure guide.
The repair-vs-replace math
Out of warranty, a microphone repair is rarely just a microphone repair. On modern MacBooks the mics are part of the top-case or board assembly, so quotes commonly land in the several-hundred-dollar range — an awkward number on a laptop that’s already five or six years old.
Two ways out of that trap:
- Work around it: any $20 USB or headset mic bypasses the internal array completely and usually sounds better on calls anyway. A dead internal mic doesn’t have to end the laptop.
- Upgrade instead of repairing: if the quote is approaching half the value of the machine, put that money toward a newer Mac. Our Apple clearance collection has a refurbished M1 MacBook Air at $569.99 and the M2 Air at $974.99 — both with three-mic arrays that are a generation better than anything in an Intel MacBook, and both with our full 1-year warranty.
FAQ
Why does my Mac microphone work in some apps but not others?
That’s a permissions problem, not a hardware one. Each app needs its own approval under System Settings → Privacy & Security → Microphone, and browsers add a second per-site permission on top.
Where is the microphone on a MacBook?
Modern MacBook Air and Pro models use a three-mic array near the speaker grilles at the top of the keyboard deck and along the side vents. There’s no single visible “mic hole” to point at, which is why blocked vents or a case that covers the deck can muffle you.
Can I replace just the microphone in a MacBook?
Not practically. The mics are integrated into the top-case assembly on most models, so an out-of-warranty fix means a top-case or board-level repair. That’s why an external USB mic is the standard cheap fix.
Does a dead microphone hurt my Mac’s trade-in value?
It lowers it, but the machine is far from worthless — we buy Macs with bad mics, bad speakers, and liquid damage every week. Before you sell or buy used, see what to check when buying a used MacBook.