首先檢查Windows Audio和Windows Audio Endpoint Builder服務(wù)是否設(shè)為自動(dòng)並已啟動(dòng)；2. 運(yùn)行系統(tǒng)自帶的音頻疑難解答工具；3. 在設(shè)備管理器中查看“聲音、視頻和遊戲控制器”是否有音頻設(shè)備，若無(wú)則掃描硬件更改或更新驅(qū)動(dòng)；4. 通過(guò)製造商官網(wǎng)、Windows Update或設(shè)備管理器手動(dòng)重新安裝音頻驅(qū)動(dòng)；5. 在聲音設(shè)置中啟用被隱藏或禁用的音頻設(shè)備；6. 進(jìn)入BIOS/UEFI確認(rèn)板載音頻控制器已啟用；7. 使用USB耳機(jī)或HDMI外接設(shè)備測(cè)試以判斷是硬件還是軟件問(wèn)題；8. 若以上均無(wú)效，可嘗試重置電腦或使用系統(tǒng)還原，多數(shù)問(wèn)題由驅(qū)動(dòng)或服務(wù)引起，前幾步可解決80%的情況。

If you're seeing the error "No audio output device is installed" on Windows 11, it means your system isn't detecting any sound devices (like speakers or headphones). This can happen due to driver issues, hardware problems, or system settings. Here's how to fix it step by step.

1. Check Audio Services and Device Detection

First, make sure Windows is actually trying to use audio hardware.

• Press Win R , type services.msc , and press Enter.
• Scroll down and find Windows Audio .
• Double-click it and ensure the Startup type is set to Automatic .
• If the service isn't running, click Start , then Apply .
• Also check Windows Audio Endpoint Builder – it should be running too.

? Sometimes these services get disabled accidentally or by third-party software.

2. Run the Audio Troubleshooter

Windows 11 has a built-in audio troubleshooter that can fix common issues.

• Go to Settings > System > Sound .
• Scroll down and click Troubleshoot common sound problems .
• Follow the prompts and let Windows detect and fix issues.

This often resolves missing driver or configuration problems automatically.

3. Check Device Manager for Audio Devices

• Press Win X and select Device Manager .
• Look for Sound, video and game controllers .
• Check if you see any audio devices listed (like Realtek, Intel SST, AMD Audio, etc.).
• If the section is missing or has a yellow exclamation mark:
  • Right-click the device (or the section) and choose Update driver .
  • Select Search automatically for drivers .

? If no audio devices appear at all:

• Click Action > Scan for hardware changes .
• Or manually reinstall the audio driver (see next step).

4. Reinstall or Update Audio Drivers

Missing or corrupted drivers are the most common cause.

Option A: Download from Manufacturer

• Identify your PC/laptop model (eg, Dell XPS 13, HP Pavilion, etc.).
• Visit the manufacturer's support site.
• Search for audio/audio driver under your model.
• Download and install the latest audio driver.

Option B: Use Windows Update

• Go to Settings > Windows Update > Advanced options > Optional updates .
• If there are driver updates (especially audio or chipset), install them.

Option C: Manual Driver Install via Device Manager

• In Device Manager, right-click any unknown device (might show as "Audio Controller" under Other devices).
• Choose Update driver > Browse my computer > Let me pick…
• You can also uninstall the current audio driver (right-click > Uninstall device), then restart your PC — Windows will try to reinstall it automatically.

5. Enable Hidden or Disabled Audio Devices

Sometimes the device is disabled.

• Right-click the speaker icon in the taskbar > Sounds > Playback tab.
• Right-click in the empty space and make sure Show Disabled Devices and Show Disconnected Devices are checked.
• If you see any audio device listed (even grayed out), right-click it and choose Enable .

6. Check BIOS/UEFI Settings

In rare cases, the onboard audio controller might be disabled in BIOS.

• Restart your PC and enter BIOS (usually by pressing F2 , Del , or Esc during boot).
• Look for settings like:
  • Onboard Audio
  • HD Audio Controller
  • Audio Controller
• Make sure it's Enabled .
• Save and exit.

7. Test with External Audio (USB Headphones or HDMI)

Plug in USB headphones or connect to a TV/monitor via HDMI.

• If sound works through USB or HDMI, the issue is likely with your internal audio hardware or driver.
• This helps narrow down whether it's a hardware or software problem.

8. Reset or Reinstall Windows (Last Resort)

If nothing works and you suspect a deep system issue:

• Go to Settings > System > Recovery > Reset PC .
• Choose Keep my files and reinstall Windows.

This often fixes corrupted system files affecting audio.

Final Tip: If you recently updated Windows and lost audio, try System Restore to revert to a point when audio was working.

Basically, most "no audio output device" issues on Windows 11 come down to drivers or services. Start with the troubleshooter and Device Manager — that fixes 80% of cases.

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