What's going on

HDMI is designed to carry uncompressed digital video and multi-channel audio over a single cable using a synchronized handshake. When you have picture but no sound, the video pipeline is fully functional, but the digital audio transport protocol between your computer's graphics processing unit (GPU) and the monitor's audio controller is failing.

Most modern monitors include built-in speakers or a 3.5mm headphone passthrough jack that relies on this digital audio stream. When audio fails over HDMI, the culprit is usually software configuration—such as the operating system sending sound to the wrong device or a missing GPU audio driver—though physical cable limitations and OSD software mutes are also common.

Symptoms people notice

• Perfect image display with zero sound output from the display.
• Windows sound menu showing no audio devices available or displaying the monitor as 'Not Plugged In'.
• Audio defaulting to your PC tower's front panel jack or laptop internal speakers.
• Popping, crackling, or immediate audio loss whenever display resolutions or refresh rates change.
• The monitor's internal menu locking out volume controls when hooked up via certain inputs.

If you are experiencing broader display issues alongside missing sound, explore our monitor problems hub for guidance on flickering, resolution glitches, and signal loss.

Likely causes

1. Incorrect OS Sound Output Routing: Windows or macOS often fails to auto-switch the default playback device to the HDMI display upon connection.
2. Outdated or Missing Graphics Audio Drivers: NVIDIA, AMD, and Intel graphics driver updates sometimes drop or corrupt the accompanying HDMI/DisplayPort audio driver.
3. Monitor OSD Audio Mute: The monitor's hardware menu may have its internal speakers muted or set to an incorrect input channel (e.g., expecting Line-In analog instead of HDMI digital audio).
4. Incompatible Adapters or Docks: Passive DisplayPort-to-HDMI or USB-C dongles frequently fail to pass audio signals correctly.
5. Subpar HDMI Cables: Older or damaged HDMI cables may carry enough bandwidth for 1080p video while dropping audio data channels.
6. Failed Monitor Mainboard DAC: Internal hardware failure on the monitor's audio board or blown speaker coils.

Quick checks first

Before digging into driver reinstalls, run through these basic quick checks:

• Unplug and Re-seat: Firmly disconnect both ends of the HDMI cable and re-seat them. A partially seated HDMI connector can maintain video pins while losing audio data pins.
• Verify Sound Source: Ensure the video file, browser tab, or app you are testing isn't individually muted in the OS Volume Mixer.
• Check the Physical Mute Switch: Some gaming monitors feature a physical mute button or slider on the bottom bezel distinct from the digital OSD menu.
• Test Another Device: Connect a gaming console, streaming stick, or another laptop to the monitor's HDMI port. If sound works from a second device, your monitor's hardware is fine and the issue lies entirely within your primary PC's software configuration.

When it's a real hardware fault

If you have verified that OS sound settings are correct, reinstall GPU audio drivers, and tested multiple known-working HDMI cables with different source devices without success, the problem likely lies within the monitor's internal hardware.

Hardware-level failures manifest in specific ways:

• The 3.5mm headphone jack on the monitor outputs sound, but internal speakers remain silent (blown internal speaker modules or damaged amplifier stage).
• Neither the headphone jack nor the speakers produce sound across any input source (failed digital-to-analog converter on the monitor mainboard).
• Constant static or loud hum whenever an HDMI cable is plugged in, regardless of volume levels (grounding issue or shorted audio circuitry).

Soft resets vs board/panel work

Soft resets—such as resetting the monitor to factory settings via the OSD, clearing graphics drivers with Display Driver Uninstaller (DDU), and adjusting OS audio sample rates—resolve roughly 90% of HDMI audio issues.

Internal hardware repair on a monitor's audio subsystem is rarely economical. Replacing individual mainboard DAC chips or micro-soldering speaker leads requires specialized equipment and schematics. If a monitor's mainboard audio processing dies out of warranty, the most practical solution is to bypass internal display audio entirely by connecting external desktop speakers directly to your PC's 3.5mm motherboard jack or using a USB DAC.

If your monitor's mainboard has suffered a catastrophic failure and you decide it's time for an upgrade, check out our unbiased hardware reviews to find reliable displays with strong audio performance.

Next steps

1. Open your OS Sound Control Panel and set the HDMI monitor as the default device.
2. Access the monitor OSD using physical controls and un-mute the audio setting.
3. Reinstall your GPU drivers (NVIDIA/AMD/Intel) to restore missing HDMI audio controllers.
4. Eliminate any video adapters, hub docks, or extension cables, testing with a direct HDMI connection.
5. If internal speakers remain silent across multiple source devices, plug desktop speakers directly into your PC tower to bypass the monitor's dead audio hardware.