If your microphone is missing from the device list entirely, no browser setting will bring it back. Here is how to separate detection failures from permission and routing failures — and fix each one.
Last reviewed on August 26, 2026
"Microphone not detected" is a different problem from "microphone not working", and mixing them up is why people spend an hour on the wrong fix. If the device does not appear in your system's sound settings at all, no amount of browser permission tinkering will help — the computer has not enumerated the hardware yet. This guide separates detection failures from permission and routing failures, then fixes each in turn.
Sixty-second triage. Open your operating system's sound settings and look at the list of input devices. If your microphone is listed, skip to detected but silent. If it is not listed, start at step 1. That single check decides everything that follows.
| What you see | Layer that failed | Where to go |
|---|---|---|
| Device absent from OS sound settings | Hardware or driver | Physical and driver checks |
| Listed in OS, absent from the browser's device list | Browser permission or policy | Permissions guide |
| Listed everywhere, but no signal | Routing, mute, or exclusive lock | Detected but silent |
| "Can't find microphone, make sure it's connected" | App asked for a device that no longer exists | App-level errors |
| Works in one app, not another | Per-app permission or device selection | App-specific guide |
The fastest way to place yourself in this table is to run our microphone test. If it lists a device name once started, detection is fine and your problem lies further down the chain.
Detection failures are disproportionately physical. Before touching any settings:
Also check Settings › Privacy & security › Microphone. If "Microphone access" is off at the system level, Windows hides the device from every application, which looks exactly like a detection failure.
USB microphones generally work on ChromeOS and modern Android via USB-C, but many phones do not supply enough power for larger microphones without a powered adapter. On iOS, only devices that are class-compliant (and often only through a Lightning or USB-C camera adapter) are detected at all.
If the device is listed and still produces nothing, the failure is routing rather than detection:
Confirm each change with the live microphone test — the level meter reacts immediately, so you get an answer per change instead of guessing.
| Message | What it really means |
|---|---|
| "Can't find microphone. Make sure it's connected and try again." | The app requested a specific device ID that no longer exists — usually after unplugging a headset. Reselect the device inside the app. |
| "No input device found" | The OS reports zero inputs. Go to step 2. |
| "Microphone is being used by another application" | Exclusive lock. Quit meeting and recording apps completely. |
| "Permission denied" / crossed-out mic in the address bar | Browser-level block, not a detection problem. See the permissions guide. |
| "Didn't hear that, tap the microphone to try again" | The device was found but no speech was recognised — usually low input level or heavy noise suppression. |
| Device appears then disappears repeatedly | Insufficient USB power or a failing cable. Plug directly into the computer. |
Conclude hardware failure only when the device is invisible on two different computers, through two cables, on direct ports. At that point the usual culprits are a broken solder joint at the plug end of the cable, a failed USB controller inside the microphone, or — for laptops — a disconnected internal ribbon cable after a repair or a drop.
Built-in laptop microphones fail rarely but not never. Before writing one off, check whether it disappeared at the same time as another symptom: a webcam that also stopped working points strongly at a single internal connector, because on most laptops the microphone array and camera share one cable.
That the operating system has not enumerated the hardware. The device is missing from the sound settings entirely, which is different from a device that is present but silent.
Most often because the device is disabled. Open the Recording tab of the sound control panel, right-click the empty area, enable Show Disabled Devices and Show Disconnected Devices, then enable your microphone.
Insufficient USB power or a charge-only cable. Plug directly into the computer rather than a hub, dock, or monitor port, and use a cable known to carry data.
Open Device Manager, uninstall the device without deleting the driver, then choose Scan for hardware changes. If that fails, install the audio driver from your laptop manufacturer rather than the chipset vendor.
The application asked for a specific device that no longer exists, usually after a headset was unplugged. Reselect the device inside that application.
Test it on a second computer or phone, through a different cable, in a direct port. If it is invisible on both machines, the device or its cable has failed.