Your monitor has built-in speakers, the DisplayPort cable carries both video and audio, and yet the moment you dock, hot-swap, or simply boot your PC, there is silence. The symptom usually looks like this: the desktop works perfectly, video is flawless, but the speaker icon in the Windows taskbar shows “No audio output device found,” lists only your headphones or headset, or lists the monitor but plays nothing when you select it. Sometimes audio drops out only after sleep, a driver update, or switching inputs, and sometimes it worked fine yesterday and vanished overnight.
It is urgent only in the sense that it is disruptive: your video signal is fine, so nothing is failing on the display side. But because the cause is almost always a software or settings issue rather than broken hardware, most people can restore monitor audio in under 15 minutes. Work through the fixes below in order — they are sorted easiest-first, and each includes how to reverse it if it does not help.
Likely Causes
| Cause | How to confirm | Fix difficulty |
|---|---|---|
| Wrong playback device selected in Windows | Right-click the speaker icon, open Sound settings, and your monitor is not the default output | Easy |
| Monitor volume or input audio muted on the monitor’s own OSD menu | Physical monitor buttons show volume at 0 or the audio source set to the wrong input | Easy |
| Monitor audio device disabled in Windows Sound settings | Right-click the speaker icon, choose Sound settings, then More sound settings — the monitor is greyed out or absent from the Playback tab | Easy |
| GPU audio driver disabled, outdated, or corrupted | Device Manager shows “NVIDIA High Definition Audio,” “AMD High Definition Audio Device,” or “Intel Display Audio” with a warning icon, or the entry is missing entirely | Moderate |
| Monitor connected over a cable or adapter that does not pass audio | Using a DP-to-DVI or DP-to-VGA adapter, or a DisplayPort-to-HDMI cable known to strip audio | Moderate |
| Motherboard or GPU audio service conflict after a Windows update | Audio worked until a recent cumulative update; Device Manager shows the monitor device with “This device cannot start” (Code 10) | Moderate to Hard |
Fix 1: Set the Monitor as the Default Playback Device
What causes it
Windows treats every audio-capable display as a separate output device. When you plug in headphones, a USB DAC, or a new GPU, Windows can silently switch the default device, or simply fail to promote the monitor when it reconnects after sleep or a cable swap.
How to check
Right-click the speaker icon in the taskbar and choose Sound settings. Under Output, see whether your monitor’s name appears. If it does but is not selected, this is your problem. If it does not appear at all, skip to Fix 3 or Fix 4.
What to do
In Sound settings, under the Output section, click your monitor’s name (it often appears as the monitor model, e.g., “LG Ultra HD” or “DELL U2723QE” — NVIDIA/AMD/Intel Display Audio). Alternatively, press Win+R, type mmsys.cpl and press Enter, select the monitor on the Playback tab, click Set Default, then click OK. Play any audio while the Properties window is open — the green level meter next to the device should bounce when sound is actually reaching it.
How to undo it
Simply reselect your previous output device the same way. Nothing is permanently changed.
Fix 2: Check the Monitor’s On-Screen Display (OSD) Menu
What causes it
Many monitors mute their speakers independently of Windows, and some models (especially LG and Gigabyte displays) tie speaker output to a specific input, or disable speakers entirely when a headphone jack device is detected. OSD volume is also stored per-input on some monitors.
How to check
Press the physical menu button on the monitor (usually under the bottom edge or on a joystick at the rear). Navigate to the Audio, Sound, or Speaker submenu and confirm volume is above 0 and mute is off. On Gigabyte monitors, also check that the Audio Source is set to the input you are using.
What to do
Raise OSD volume to 50–100 and unmute. If there is a “Line Out” vs “Speaker” or “Headphone” output option, choose Speaker. On Dell monitors, check Audio under the Display or Input menu; on LG, look under General or Sound. Save and exit the menu.
How to undo it
Return to the same submenu and restore your previous values, or perform a factory reset from the OSD (usually Settings or System, then Reset or Initiate Factory Reset).
Fix 3: Re-enable a Disabled Audio Device
What causes it
Windows sometimes disables the DisplayPort audio endpoint after a driver install, a Windows update, or when a device fails to enumerate. A disabled device never reappears in the normal Sound settings list, which makes the problem look like missing hardware.
How to check
Press Win+R, type mmsys.cpl, press Enter. In the Playback tab, right-click anywhere in the white space and enable both “Show Disabled Devices” and “Show Disconnected Devices.” If your monitor appears greyed out, it was disabled.
What to do
Right-click the greyed-out monitor entry and choose Enable. Then right-click again and choose “Set as Default Device.” Click OK. If it still shows “Not plugged in” after enabling, power-cycle the monitor (turn it off, unplug its power cable for 30 seconds, reconnect).
How to undo it
Right-click the device and choose Disable if you need to revert.
Fix 4: Restart Windows Audio Services
What causes it
The Windows Audio Endpoint Builder service can hang after a display hotplug or a fast startup resume, leaving new audio endpoints (like a just-connected monitor) unregistered even though the driver is fine.
How to check
Press Win+R, type services.msc, press Enter. Locate “Windows Audio” and “Windows Audio Endpoint Builder.” If either shows a status other than “Running,” or if audio endpoints stopped appearing after resume, the service is suspect.
What to do
Right-click “Windows Audio Endpoint Builder” and choose Restart, then restart “Windows Audio” the same way. Confirm both Startup types are set to Automatic. Reboot the PC afterward — a full restart (not Shut down, since Fast Startup preserves the old session) often clears this permanently. To rule out Fast Startup entirely, go to Control Panel, Power Options, “Choose what the power buttons do,” click “Change settings that are currently unavailable,” and untick “Turn on fast startup.”
How to undo it
Re-enable Fast Startup in the same Control Panel location if you want it back.
Fix 5: Reinstall or Roll Back the GPU Audio Driver
What causes it
DisplayPort audio travels through the graphics card’s embedded audio controller (NVIDIA High Definition Audio, AMD High Definition Audio Device, or Intel Display Audio). A broken, generic, or outdated version of this driver means Windows never sees the monitor as an audio device at all.
How to check
Right-click Start, choose Device Manager, expand “Sound, video and game controllers” and “System devices.” Look for the GPU audio entry. A yellow triangle, a Code 10 or Code 45 error, or a missing entry after a recent driver update points here. Also check “View,” then “Show hidden devices” to see if it is greyed out.
What to do
In Device Manager, right-click the GPU audio device and choose “Uninstall device,” tick “Attempt to remove the driver for this device” if offered, then reboot — Windows will re-detect and reinstall it. If that fails, download the latest full graphics driver package (NVIDIA App, AMD Adrenalin, or Intel Arc/Graphics driver installer) and choose a clean/custom installation that includes the HD Audio component. If audio broke immediately after a driver update, use Device Manager, Properties, Driver tab, then “Roll Back Driver” instead.
How to undo it
Roll Back Driver, or reinstall your previous driver version from the vendor’s archive. No system changes persist beyond the driver itself.
Fix 6: Swap the Cable or Eliminate the Adapter
What causes it
Not every DisplayPort path carries audio. DP-to-DVI and DP-to-VGA adapters never pass audio. Cheap DP-to-HDMI cables without an audio-capable protocol converter strip it. Damaged or badly shielded DisplayPort cables can also fail audio lanes while video still works, since video is more tolerant of signal degradation.
How to check
Identify what sits between the PC and monitor. If anything in the chain converts to DVI, VGA, or USB-C without DisplayPort Alt Mode support, that is the culprit. If it is a straight DisplayPort cable, inspect it for kinks and try reseating both ends firmly (DisplayPort connectors latch — press until it clicks and release the latch tab when removing).
What to do
Replace the chain with a VESA-certified DisplayPort cable (HBR2/HBR3-rated, 8K-rated cables are backward compatible) or connect via a straight HDMI 2.0+ cable temporarily to test. If HDMI produces sound but DisplayPort does not with both cables seated properly, the monitor’s DP audio path or the GPU port may be faulty. Also try a different DisplayPort output on the GPU if available.
How to undo it
Reinstall your original cable and adapter. Hardware swaps are inherently reversible.
Fix 7: Power-Cycle and Hard-Reset the Monitor
What causes it
Monitor firmware can get into a bad state where the EDID still advertises speakers but the internal audio amplifier is hung. Hotplugging DisplayPort while the PC is running makes this more likely.
How to check
Audio vanished immediately after a display hotplug, sleep cycle, or input switch, and the monitor appears correctly in Windows Sound settings but produces nothing.
What to do
Turn the monitor off with its power button, unplug the power cable from the wall for a full 60 seconds (this drains residual power and resets internal firmware), then reconnect, power on, and re-check the Windows playback device list. On monitors with firmware updates available (Dell, LG, Samsung via their on-screen menus or support utilities), apply the latest firmware.
How to undo it
No settings are changed by a power cycle; a factory reset via the OSD reverses any firmware menu tweaks if needed.
Fix 8: Test with a Clean Audio Stack and Disable Enhancements
What causes it
Third-party audio software (Sonar, Voicemeeter, Nahimic, Realtek enhancements, steelseries GG) can seize or reroute audio endpoints, leaving the monitor device present but silent. Loudness Equalization and other enhancements applied to the monitor endpoint can also mute low-level output.
How to check
In mmsys.cpl, select the monitor, click Properties, then the Enhancements tab (or “Advanced” tab, then disable “Signal Enhancements”). If enhancements were recently enabled or audio software was recently installed, this is likely.
What to do
Tick “Disable all enhancements” (or “Disable all sound effects”), click Apply, and test. Quit any audio routing software from the system tray. If a specific app is at fault, open its settings and either exclude the monitor endpoint or uninstall it. Then retest playback with the monitor set as default.
How to undo it
Re-enable enhancements or relaunch the audio software as desired.
If Nothing Works
If the monitor still produces no sound after all of the above, test the DisplayPort output against another PC or a laptop with DP/USB-C, and test another monitor on your PC. If the monitor is silent on a known-good system, its internal amplifier or speakers have likely failed — check whether it is under warranty (most carry 1–3 years of coverage) and contact the manufacturer with your proof of purchase. If your PC shows no DisplayPort audio device even with a known-good monitor and a fresh driver install, the GPU’s audio controller may have failed; a workaround is to run video over DisplayPort and audio over a separate connection (HDMI cable, USB, or the motherboard’s analog output to powered speakers), which bypasses the problem entirely. As a last resort on the Windows side, create a new user profile to rule out a corrupt per-user audio configuration, or run an in-place repair install of Windows via Setup from the Media Creation Tool, which preserves your files and apps.
FAQ
Does DisplayPort carry audio as well as video?
Yes. DisplayPort carries up to 8 audio channels alongside video, using the same Main Link data lanes plus the AUX channel for device negotiation. This is why a single DisplayPort cable should fully replace a separate audio cable — assuming the GPU audio driver is installed and Windows selects the monitor as the output.
Why does my monitor appear in Windows but produce no sound?
This usually means the audio endpoint is registered but the signal is blocked downstream: the monitor’s OSD volume is at zero, the wrong audio output (headphone jack vs speakers) is selected in the monitor menu, or enhancements/routing software is intercepting the stream. Work through Fixes 2 and 8 first.
Can a bad DisplayPort cable cause audio but not video problems?
It can cause audio loss while video still works, because video signal is more tolerant of marginal link quality than the audio stream and the AUX negotiation. If reseating does not help, try a VESA-certified cable rated HBR3 or better.
Do I need to install a separate driver for monitor speakers?
No standalone driver is needed for the monitor itself. The audio path depends on your graphics card’s embedded audio driver (NVIDIA High Definition Audio, AMD High Definition Audio, or Intel Display Audio), which comes bundled with the full GPU driver package. If it is missing, reinstall the complete GPU driver rather than hunting for a monitor-specific driver.
