Few things are more frustrating than sitting down to watch a video or join a call and discovering that your PC has no sound. Audio problems in Windows are surprisingly common, and they can be caused by anything from a muted volume setting to a corrupted audio driver. The good news is that most cases can be resolved without professional help — if you know where to look. This guide walks you through the most common causes and fixes for sound not working on Windows 10 and Windows 11.
1. Start With the Obvious: Check Your Volume and Output Device
Before diving into settings, rule out the simplest causes:
- Volume muted or too low — click the speaker icon in the taskbar and make sure the volume slider is turned up and not muted (a red X on the icon is a giveaway).
- Wrong output device selected — if you recently connected headphones, a monitor with speakers, or a Bluetooth device, Windows may have switched the audio output automatically. Click the arrow next to the speaker icon and check which device is set as the active output.
- Application volume — right-click the speaker icon and choose Open Volume Mixer. Each open app has its own volume control, and individual apps can be muted independently of the system volume.
2. Run the Windows Audio Troubleshooter
Windows includes a built-in troubleshooter that can automatically detect and fix common audio problems. To run it:
- Open Settings and go to System > Troubleshoot > Other troubleshooters (Windows 11) or Update & Security > Troubleshoot > Playing Audio (Windows 10).
- Click Run next to the Playing Audio troubleshooter.
- Follow the on-screen prompts. Windows will attempt to detect and repair the issue automatically.
This step resolves a surprising number of audio problems — particularly those caused by services that have stopped running in the background.
3. Check That the Windows Audio Service Is Running
Windows audio depends on a background service called the Windows Audio service. If this stops running, you'll lose all sound. To check:
- Press Windows + R, type
services.msc, and press Enter. - Scroll down to Windows Audio and double-click it.
- If the status shows anything other than Running, click Start. Also ensure the Startup type is set to Automatic.
- Repeat for Windows Audio Endpoint Builder.
4. Update or Reinstall Your Audio Driver
A corrupt or outdated audio driver is one of the most common causes of sound problems — especially after a Windows update. Here's how to address it:
- Right-click the Start button and choose Device Manager.
- Expand Sound, video and game controllers.
- Right-click your audio device (often listed as Realtek High Definition Audio, Intel Smart Sound Technology, or similar) and choose Update driver.
- If updating doesn't help, try Uninstall device and then restart your PC — Windows will reinstall the driver automatically on reboot.
If a recent Windows update broke your sound, you can also try rolling back the driver. Right-click the audio device in Device Manager, choose Properties, and look for the Roll Back Driver button on the Driver tab.
5. Check Your Default Playback Device
Windows needs to know which device to send audio to. If the wrong device is set as default, sound will play silently to an output that isn't connected:
- Right-click the speaker icon in the taskbar and select Sound settings (Windows 11) or Sounds (Windows 10).
- Under Output, ensure the correct device (your speakers, headphones, or monitor) is selected.
- On Windows 10, click Manage sound devices and make sure the device you want is not disabled.
6. Check Your HDMI or Display Output Audio
If you're connecting your PC to a TV or monitor via HDMI or DisplayPort, audio is often sent through the cable to the display's built-in speakers — even if you want it to come from your PC's speakers. Check your output device settings (see above) and ensure your PC speakers or headphones are selected rather than an HDMI output.
7. Inspect Your Hardware
Software fixes won't help if the problem is physical. Things to check:
- Speaker or headphone connections — ensure the 3.5mm audio jack is fully inserted. Try a different port (front vs rear panel on a desktop).
- Test with different speakers or headphones — this quickly isolates whether the problem is the output device or the PC itself.
- Check for damage — a bent pin in the audio jack, a loose internal connection, or a damaged audio chip on the motherboard can all cause permanent loss of sound.
If you've tried all of the above and the problem persists, the issue may be hardware-related. Our software troubleshooting service covers audio diagnostics, and if the fault lies with the audio hardware itself, we can assess whether a repair or hardware upgrade is the right path forward.
When to Get Professional Help
If none of the above steps restore your sound, it's worth getting a professional diagnosis. Common hardware faults — such as a failed audio chip, a damaged motherboard audio section, or a broken headphone socket — cannot be fixed through Windows settings alone. For laptops, internal speaker faults are also fairly common after drops or liquid exposure.
At PC Repair Services Edinburgh, we diagnose and repair audio faults on desktops and laptops across Edinburgh and the surrounding areas including Leith, Dalkeith, and Musselburgh. Whether it's a driver issue or a hardware fault, we'll find the cause and fix it. Book a repair online or get in touch — we're happy to advise.