Start with the simplest checks first
Before you dig into settings, check three things that fix most sound problems in under a minute. First, look at your speaker icon in the taskbar (Windows) or menu bar (Mac) — if it has an X or line through it, click it and unmute. Second, make sure the volume slider is not all the way down. Third, if you are using external speakers or headphones, unplug them and plug them back in, or try a different USB port or audio jack.
If sound still does not work after those three steps, the problem is usually a driver, a disabled audio device, or a cable issue. The next sections walk you through finding which one.
Key Takeaways
- Check the mute button, volume level, and physical connections before assuming a deeper problem exists.
- On Windows, open Device Manager and look for a yellow exclamation mark next to your audio device — that means the driver needs attention.
- On Mac, go to System Settings > Sound and confirm your output device is selected and not muted.
- Restarting your computer fixes audio driver conflicts about half the time and takes only a few minutes.
- If your audio device does not appear in Device Manager or Sound settings at all, the hardware may not be recognized by your operating system.
Windows: Check Device Manager for driver problems
Open Device Manager by right-clicking the Start button and selecting Device Manager, or by typing "Device Manager" into the search box. Look for a section called "Sound, video and game controllers" and click the arrow to expand it.
You should see your audio device listed — usually something like "Realtek High Definition Audio" or "Intel Smart Sound Technology". If there is a yellow exclamation mark next to it, the driver is broken or missing. Right-click the device, select "Update driver", then choose "Search automatically for updated driver software". Windows will search for and install the correct driver from its library.
If the device has no exclamation mark but sound is still not working, right-click it anyway and select "Disable device", wait five seconds, then right-click again and select "Enable device". This resets the driver connection. If you see no audio device at all in that list, your hardware may not be recognized — skip to the "Hardware not recognized" section below.
Mac: Check System Settings and output devices
Click the Apple menu, select System Settings, then click Sound in the sidebar. Under "Output", you should see a list of devices — your built-in speaker, any connected headphones, or external speakers. Make sure the correct device is selected (it will have a checkmark next to it).
Below the device list, check that the output volume slider is not all the way to the left. If the volume is up but you still hear nothing, click the device name and look for a "Mute" checkbox — uncheck it if it is checked.
If your audio device does not appear in the Output list at all, disconnect and reconnect it, wait ten seconds, then check the list again. If it still does not show up, the device may not be recognized by macOS.
Restart your computer to reset audio drivers
A restart clears temporary driver conflicts and resets audio connections without requiring you to change any settings. Shut down your computer completely, wait 30 seconds, then turn it back on. Once it has fully booted, test your sound.
This works because audio drivers sometimes get stuck in a bad state after a sleep, an update, or a device disconnect. A full restart forces them to reload from scratch. If sound works after a restart but stops working again later, the problem is likely a driver that needs updating — go back to the Device Manager or System Settings steps above and check for updates.
Check for loose cables and test different ports
If you are using external speakers or headphones, unplug the cable from your computer and from the device itself. Look at both ends of the cable for bent pins, corrosion, or visible damage. Plug the cable back in firmly — it should click or seat with a slight resistance.
If you have multiple USB ports or audio jacks, try a different one. Some ports share power or data lines with other devices, and a conflict can disable audio on that port. If sound works in a different port, the original port may be failing and you can use the working one instead.
For headphones with a 3.5 mm jack, make sure nothing is blocking the jack on your computer — lint or debris can prevent a full connection. Use a flashlight to look inside the jack and gently clean it with a dry cotton swab if needed.
Uninstall and reinstall your audio driver
If updating the driver did not work, removing it completely and letting your operating system reinstall it from scratch sometimes fixes corruption. On Windows, open Device Manager again, right-click your audio device, and select "Uninstall device". Check the box that says "Attempt to remove the driver software for this device" and click Uninstall.
Restart your computer. Windows will automatically detect the audio device and reinstall the driver. This takes a few minutes and you may see a notification in the taskbar while it happens. Once the restart is complete, test your sound.
On Mac, driver reinstallation is handled automatically by the operating system and you cannot manually remove audio drivers the way you can on Windows. If sound is still not working after restarting, move to the next section.
What to do if your audio device is not recognized
If your audio device does not appear in Device Manager (Windows) or Sound settings (Mac), your computer is not detecting the hardware at all. For external speakers or headphones, try these steps in order: unplug the device, restart your computer, then plug it back in and wait 15 seconds for the system to recognize it.
If it is still not recognized, try a different cable or a different USB port. If you have access to another computer, test the device there to confirm it is not broken. If the device works on another computer but not yours, the problem is your computer's audio hardware or a driver that cannot be repaired by reinstalling.
For built-in audio (speakers or microphone that came with your computer), if the device does not appear in Device Manager or Sound settings after a restart, the audio hardware itself may have failed. At that point, external USB speakers or a USB audio interface are your options for getting sound back.
Frequently Asked Questions
Why is my volume slider all the way up but I still cannot hear anything?
Check three places: the system volume (taskbar or menu bar), the volume in whatever program you are using (like a browser or media player), and whether the device itself is muted. Some programs have their own volume control separate from system volume. Also confirm your speakers or headphones are powered on — many external speakers have an on/off switch or require batteries.
I see my audio device in Device Manager but it says "Unknown Device" — what does that mean?
Your computer detected the hardware but does not have a driver for it. Right-click the Unknown Device and select "Update driver", then choose "Search automatically for updated driver software". If Windows cannot find a driver, visit the manufacturer's website (check your device manual or the box it came in for the brand name) and read the driver from there, then install it manually.
Sound works through headphones but not my speakers — is my speaker broken?
Not necessarily. Check your Sound settings and confirm your speakers are selected as the output device, not your headphones. On Windows, right-click the speaker icon and select "Open Volume mixer" to see which device is active. On Mac, go to System Settings > Sound and check the Output tab. If speakers are selected but still silent, try unplugging and replugging them, or test them in a different USB port.
My sound cuts out randomly or only works after I restart — what causes that?
This usually means your audio driver is unstable or conflicting with another device. Check for driver updates in Device Manager (Windows) or System Settings (Mac). If updates are available, install them. If the problem continues, try disabling any recently added USB devices or audio software you installed before the problem started — one of them may be causing the conflict.
Can I test my speakers to make sure they are working?
Yes. On Windows, open Sound settings, scroll to "Advanced", and click "Volume mixer". Find your process (like a browser) in the list and make sure its volume is not muted or turned down. On Mac, go to System Settings > Sound, click the Output tab, select your speakers, and play a video or audio file in your browser. If you hear nothing, the speakers themselves may be off or broken.