No Sound: Troubleshooting Guide #1

Quick Answer

No sound from your PC is almost always caused by one of four things: wrong audio output device selected in Windows, muted or zero-volume audio, a loose cable connection, or a driver issue. Most cases are resolved within five minutes without any technical expertise.

Start Here: The Quick Checks That Fix 80% of Cases

Before diving into settings, check the physical connections. If you are using speakers, verify the power cable is plugged in and the 3.5mm audio jack is seated in the correct port (usually the green jack on the rear of a desktop, or the headphone port on a laptop). If using USB audio or a headset, try unplugging and replugging into a different USB port.

Next, look at the system tray in the bottom-right corner of Windows. Click the speaker icon. Confirm the volume slider is not at zero and the speaker is not muted (a line through the speaker icon means muted - click it to unmute). This solves the problem more often than you might expect.

Fixing the Wrong Output Device in Windows 11/10

Windows frequently switches the default audio device when new hardware is connected, such as plugging in a monitor with built-in speakers via HDMI. Your audio might be playing correctly - just through the wrong device.

Right-click the speaker icon in the taskbar and select Sound Settings. Under Output, check which device is selected. If it shows a monitor or HDMI device instead of your speakers or headphones, click the dropdown and switch to the correct output. If the correct device is not listed, it may not be detected - proceed to the driver section below.

Updating or Reinstalling Audio Drivers

Driver issues are common after Windows updates. Open Device Manager (search for it in the Start menu), expand Sound, video and game controllers, and look for your audio device. If there is a yellow warning triangle, the driver has a problem.

Right-click the audio device and select Update driver, then Search automatically for drivers. If that does not resolve it, right-click and Uninstall device, check the box to delete the driver software, then restart your PC. Windows will reinstall the default audio driver automatically on reboot. For Realtek HD Audio (the most common onboard audio chipset), downloading the latest driver directly from the Realtek website or your motherboard manufacturer's support page is the most reliable fix.

Frequently Asked Questions

My headset works on my phone but not my PC - why?

This usually means the PC's audio jack does not support the 4-pole TRRS connector that combined headset/microphone cables use. Desktop PCs with separate mic and headphone jacks need a splitter adapter, or use a USB connection instead.

I hear a crackling or static noise rather than no sound - is this the same issue?

No. Crackling typically points to a sample rate mismatch, an electromagnetic interference issue, or a failing audio component. Right-click the speaker icon, go to Sound Settings, then More sound settings, select your output device, click Properties and then Advanced - change the sample rate to 24-bit 48000Hz and test.

Could loadshedding have caused my sound card to fail?

Power surges during loadshedding recovery are a real hardware risk in South Africa. If you lost sound immediately after a power restoration event, the onboard audio or a discrete sound card may have been damaged by a surge. A surge-protected UPS or power strip is the best prevention. In this case, a USB audio adapter (available from under R200) is a quick workaround while assessing damage.