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Audio & Headphones
5 min read

No Sound: Working Through the Audio Chain

Output selection, muted mixers and disabled devices explain nearly every silent computer.

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At a glance

  • →Silence has many causes that all sound the same.
  • →Output selection is the leading cause after a display change.
  • →Per-app volume hides in plain sight.

Sound passes through a chain: the app, the system mixer, the selected output device, and finally the speaker or headphones. Silence anywhere along that chain sounds identical.

The most common break is output selection. Plugging in a monitor over HDMI or connecting headphones switches the default output, and audio then plays to a device with no speakers.

Per-app volume is the second. Modern systems keep a separate level for each application, so one app can be muted while everything else works normally.

Only after those two should you suspect drivers or hardware — and a quick test with another output device usually settles it.

Common causes

  • Output switched to a monitor or an idle Bluetooth device
  • A single app muted in the volume mixer
  • An output device disabled in sound settings
  • A driver replaced during a system update
  • A physical mute switch or unplugged cable

Troubleshooting tips

  1. 1Check the selected output device before anything else.
  2. 2Open the per-app volume mixer and look for a muted entry.
  3. 3Test a different output such as headphones to split hardware from software.
  4. 4Re-enable any device shown as disabled in sound settings.
  5. 5Restart the audio service or the machine before reinstalling drivers.

Key takeaways

  • • Silence has many causes that all sound the same.
  • • Output selection is the leading cause after a display change.
  • • Per-app volume hides in plain sight.

Related guides

4 min readWhy Audio Stops WorkingSilence is usually the wrong output device, not a broken speaker. 6 min readDrivers Explained: The Translators Inside Your PCDrivers let the operating system speak to hardware, and a mismatched one causes glitches that look like broken parts.

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