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No sound on Windows - find the cause in order

Silent PCs are rarely broken - something in the audio chain is pointed the wrong way: the wrong output device, a muted app, a stopped service or a failed driver. Instead of trying fixes at random, walk this checklist from top to bottom; each step takes a minute and rules out one link of the chain.

Quick answer

Click the speaker icon in the taskbar and check the output device first - after connecting a monitor or TV, Windows often switches sound to its HDMI output. Pick your speakers or headphones, then check volume. That single step solves a large share of "no sound" cases.

Symptoms - how this problem looks

No sound anywhere, though the volume looks fine
Sound gone after connecting a monitor or TV
One app is silent while others play
The volume icon has a red X or says "No output device"
Sound disappeared after a Windows update
Bluetooth headphones connect but audio still plays elsewhere

Why it happens

Wrong output selected

HDMI monitors, TVs and USB devices register as audio outputs and silently become the default.

Muted in the mixer

Windows keeps per-app volume - one accidental mute in the mixer silences just that app, which looks like a mystery.

Driver failed or was replaced

After updates, the audio driver may be swapped for a generic one or stop working - the device disappears from the output list.

Audio services stopped

Windows Audio and its endpoint service occasionally hang; every device then shows as unavailable.

The fixes, in order

1. Check the output device and volume

  1. Click the speaker icon in the taskbar.
  2. Open the output device list (the arrow or name next to the volume slider) and select your actual speakers or headphones.
  3. Raise the volume and play any sound.
  4. Unplug HDMI/DisplayPort from a TV you are not using for sound - or keep the selection on your speakers.

2. Check the volume mixer for per-app mutes

  1. Right-click the speaker icon and open Volume mixer.
  2. Make sure the silent app is present, unmuted and raised.
  3. In app sound settings (Settings, then System, then Sound, then Volume mixer) confirm the app outputs to the right device.

3. Run the audio troubleshooter

  1. Open Settings, then System, then Troubleshoot, then Other troubleshooters.
  2. Run Playing Audio and apply what it suggests - it resets devices and services in the right order.

4. Restart the audio services

  1. Press Win+R, type services.msc and press Enter.
  2. Find Windows Audio and Windows Audio Endpoint Builder.
  3. Right-click each and choose Restart, then test the sound.

5. Check Bluetooth and disable audio enhancements

  1. Bluetooth headphones: remove the device in Settings, then Bluetooth & devices, and pair again - and make sure they are not connected to your phone at the same time.
  2. In Settings, then System, then Sound, open the output device properties and turn off Audio enhancements / spatial sound - enhancements cause silence or distortion on some drivers.

6. Fix the driver

  1. If the device is missing from the output list or shows errors in Device Manager, the driver is the remaining suspect.
  2. Follow the Realtek audio driver guide - roll back, clean reinstall and the correct download source, step by step (most PCs use a Realtek codec).

The automatic option

If you do not know the exact model, several devices need attention at once, or the manual route did not find a match - Outbyte Driver Updater identifies your installed hardware automatically and updates the drivers from official sources, with a backup before every change. The scan and diagnosis are free.

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Frequently asked questions

Sound vanished exactly when I plugged in a second monitor. Why?

The monitor registered as an HDMI audio device and Windows switched the default output to it. Select your speakers in the output list (method 1) - and Windows remembers the choice per device combination.

Only the browser is silent - games and music play. What is that?

A per-app mute or a per-app output device: open the Volume mixer (method 2), unmute the browser and check its output device. Also check the mute button on the browser tab itself.

Everything looks right but there is still no sound. What is left?

The driver layer: a generic or failed audio driver keeps devices off the list or silently broken. Reinstall it properly - the Realtek guide walks through roll back, clean reinstall and the right download source.