recover audio after brown out and power outage

Follow these steps in order to restore audio devices and drivers in Windows 11 after the brownout/power outage. These steps do not require reinstalling Windows.

1. Check that Windows sees any audio device
   1. Select Start, type Device Manager, and open it.
   2. Expand Sound, video and game controllers.
   3. If no devices are listed, or there is a yellow warning icon, continue with driver reinstall steps below.
2. Run the built‑in audio troubleshooter
   1. Open Settings > System > Troubleshoot > Other troubleshooters.
   2. Run Playing Audio and apply any fixes it suggests.
3. Update the audio driver using Device Manager
   1. In Device Manager, under Sound, video and game controllers, right‑click the audio device (for example, Realtek, Intel, or similar).
   2. Select Update driver.
   3. Select Search automatically for drivers and follow the on‑screen instructions.
   4. Restart the PC when finished.
4. Reinstall the audio driver if update does not help
   1. In Device Manager, under Sound, video and game controllers, right‑click the audio device and select Uninstall device.
   2. If shown, check Attempt to remove the driver for this device (or Delete the driver software for this device) and select Uninstall.
   3. Restart the PC (select Start > Power > Restart).
   4. After restart, Windows should automatically reinstall the audio driver.
   5. If no driver is installed automatically, visit the laptop manufacturer’s support site, download the latest Windows 11 audio driver for the exact model, install it, and restart.
5. Try the generic Windows audio driver (if the manufacturer driver still fails)
   1. In Device Manager, under Sound, video and game controllers, right‑click the audio device and select Update driver.
   2. Select Browse my computer for drivers > Let me pick from a list of available drivers on my computer.
   3. Choose High Definition Audio Device (or similar generic entry) and select Next to install it.
   4. Restart and test sound.
6. Check for special IDT High Definition Audio CODEC (if present)
   1. In Device Manager, under Sound, video and game controllers, look for IDT High Definition Audio CODEC.
   2. If present, right‑click it and select Update driver.
   3. Choose Browse my computer for drivers > Let me pick from a list of available drivers on my computer.
   4. Select High Definition Audio Device and then Next.
   5. Restart and test.
7. Restart Windows audio services (if devices appear but sound is still missing)
   1. Press Start, type services, and open Services.
   2. Find and restart these services one by one (right‑click > Restart):
      • Windows Audio
      • Windows Audio Endpoint Builder
      • Remote Procedure Call (RPC)
   3. Ensure Windows Audio and Windows Audio Endpoint Builder have Startup type set to Automatic.
8. Check volume and enhancements (if sound is present but very low or inconsistent)
   1. Go to Settings > System > Sound > Volume mixer and confirm:
      • System volume is turned up.
      • The affected app is not muted and its volume is turned up.
   2. Under Sound > Output, select the output device, then:
      • Turn Audio enhancements off and test.
      • Under Advanced / Default format, try a different format and test.
9. If audio disappeared after a Windows Update
   Since a brownout/power event can coincide with updates:
   1. In Device Manager, right‑click the audio device > Properties > Driver tab.
   2. Select Roll Back Driver if available and follow the prompts.
   3. If rollback is not available or does not help, use System Restore again to a restore point created before the issue (if available), as described in the audio troubleshooting article.
10. About the Windows 11 Pro product key
    For a laptop purchased with Windows 11 Pro preinstalled, the product key is typically embedded in the device firmware and is read automatically by Windows during reinstall. A manual key is usually not required when reinstalling the same edition on the same device. If a full reinstall ever becomes necessary, choose Windows 11 Pro during setup; activation should occur automatically once online.

If, after all driver reinstall and service checks, Device Manager still shows no audio device at all, the brownout may have caused hardware damage. In that case, contact the laptop manufacturer’s support for hardware diagnostics.

References:

• Fix sound or audio problems in Windows
• Update Audio drivers in Windows
• Fix low or quiet sound in Windows
• How to fix this. no audio device is installed - Microsoft Q&A
• My audio inputs and outputs suddenly disappeared, how do i fix this? - Microsoft Q&A
• NO SOUND DEVICE INSTALLED - Microsoft Q&A
• cannot increase volume even if trouble shooter updates it - Microsoft Q&A