Quick Answer
No sound on a PC is almost always caused by one of four things: the wrong audio output device is selected in Windows, the driver has crashed or become corrupted, audio is muted in the system or application, or a hardware connection is loose. Most cases are solved in under 5 minutes by working through these causes in order.
Step 1 - Check Windows Audio Output Device
The most common reason for sudden silence is Windows switching to a different audio output device - this often happens when you plug in a new USB device, connect an HDMI cable to a monitor, or install a driver update. Right-click the speaker icon in the system tray and select "Open Sound settings." Under Output, check which device is selected. If it shows your monitor, HDMI output, or a device you do not use, switch it back to your speakers or headset. Right-click the speaker icon again and choose "Open Volume Mixer" to ensure the application you are trying to hear is not individually muted.
For South African gamers running full gaming PC builds with dedicated sound-card-level audio via a gaming headset, also check the headset's own volume wheel and mute toggle.
Step 2 - Restart and Reinstall Audio Drivers
If the output device is correct and audio is still silent, the audio driver has likely crashed or become corrupted. Open Device Manager (Win + X, then Device Manager), expand "Sound, video and game controllers," right-click your audio device, and select "Disable device." Wait 10 seconds, then right-click and choose "Enable device." This forces a driver restart. If the issue persists, right-click the device and select "Uninstall device," checking the box to remove driver software. Restart your PC - Windows will automatically reinstall a basic driver. For full functionality, download the latest audio driver from your motherboard manufacturer's support page.
Step 3 - Check Physical Connections and Hardware
If software fixes do not resolve the issue, move to hardware. Unplug and firmly reseat your headset or speaker cables. If you are using the 3.5mm jack on the front panel of a PC case, try the rear I/O panel instead - front panel audio connectors are sometimes not fully wired internally. If you are using a USB headset, try a different USB port to rule out a port-level fault. For HDMI audio to a monitor, confirm the monitor's speakers are enabled in its own OSD menu and that the HDMI cable is fully seated.
Frequently Asked Questions
Why does my sound disappear only in games but not other apps? This is typically an application-specific volume setting. Open Volume Mixer while the game is running and check if the game's volume slider is at zero. Also verify the game's own audio settings have not been reset to muted.
What does it mean when audio shows as working but I hear nothing? This usually means the audio is routing to the correct device but that device's physical output is muted or at zero volume - either through a hardware knob, the device's own software, or a Windows Volume Mixer setting for that specific app.
Can a Windows Update cause no-sound issues? Yes. Windows Updates occasionally overwrite audio drivers with generic Microsoft versions. If sound stopped after an update, roll back the audio driver in Device Manager or reinstall the manufacturer's driver.
