HDMI Port Not Working in Windows 10? Fix HDMI Output and Audio Problems

If your HDMI port is not working in Windows 10, start with the cable and display input, then confirm Windows is sending video to the external screen. If video works but sound does not, select the HDMI device as the audio output. Driver rollback or reinstallation should come later, after the simpler checks.

Quick checks before changing Windows settings

• Turn the monitor or TV on and select the HDMI input that matches the port you used.
• Reconnect the HDMI cable firmly at both ends.
• Try a different known-good HDMI cable and, if available, another HDMI port on the display.
• If you are using a dock, dongle, switch, or adapter, temporarily connect the PC directly to the display. Microsoft specifically recommends removing accessories while isolating external-monitor problems.

If the same monitor and cable work with another computer, the problem is more likely on the Windows PC. See Microsoft’s external monitor troubleshooting guide for the same isolation approach.

1. Choose the correct Windows projection mode

Press Windows key + P. Choose Duplicate, Extend, or Second screen only. If the PC is set to PC screen only, the HDMI display can remain blank even though the cable is connected.

2. Make Windows detect the HDMI display

Open Settings > System > Display. Under Multiple displays, select Detect. Microsoft documents this path for Windows 10 in its multiple-monitor setup guide.

3. Reset the graphics driver

If HDMI worked previously and suddenly stopped, press Windows key + Ctrl + Shift + B. The screen may blink or briefly go dark while Windows resets the graphics driver. Microsoft lists this shortcut as a troubleshooting step for an existing external-monitor setup.

4. Check the display adapter in Device Manager

Right-click Start and open Device Manager, then expand Display adapters. Use the actual Intel, AMD, or NVIDIA graphics device listed there; the old article’s “Parallel Display” label is not a standard Windows device name.

If the HDMI failure began after a driver change, open the adapter’s Properties > Driver tab and try Roll Back Driver. If rollback is unavailable, update or reinstall the display driver.

5. Update, roll back, or reinstall the graphics driver

Microsoft recommends Windows Update as one source for drivers and also supports updating or reinstalling through Device Manager. For many laptops and desktops, the PC maker’s support page is preferable when it provides a customized graphics package.

1. In Device Manager, right-click the display adapter and choose Update driver.
2. If the problem started immediately after an update, use Properties > Driver > Roll Back Driver.
3. If neither helps, choose Uninstall device, restart Windows, and let the device be detected again before installing the appropriate current driver.

Microsoft’s Device Manager driver instructions cover these supported actions.

6. Fix HDMI video that works but has no sound

HDMI can carry both video and audio, but Windows may still send sound to the laptop speakers. Open Control Panel > Hardware and Sound > Sound. On the Playback tab, select the TV or monitor’s HDMI audio device and choose Set as Default Device. If the display has no speakers, keep your speakers or headphones as the default instead.

Microsoft’s Windows audio troubleshooting page confirms that HDMI devices may need to be selected as the default output.

7. Repair Windows system files only if the basic fixes fail

Do not use “registry cleaner” utilities for an HDMI problem. If Windows components appear damaged or several hardware features are malfunctioning, open Command Prompt as administrator and run these supported Microsoft repair commands in order:

DISM.exe /Online /Cleanup-Image /RestoreHealth
sfc /scannow

Microsoft recommends running DISM before SFC in its System File Checker guidance.

8. Know when the HDMI port may be a hardware problem

If Windows never detects the display after you have tested another cable, another monitor, another video output, and the correct graphics driver, the HDMI port or graphics hardware may be faulty. A repair technician or the PC manufacturer can test the physical port more reliably than a generic “port tester” recommendation.

Windows 10 support note: Microsoft ended standard Windows 10 support on October 14, 2025. Windows 10 PCs still run, but Microsoft no longer provides normal free security fixes and technical support. Eligible devices may use the Windows 10 Extended Security Updates program, or move to a supported Windows version. See Microsoft’s Windows 10 end-of-support notice.