您的Mac是否无法通过内置扬声器或外部音频设备发出声音？这可能会令人沮丧，尤其是当您需要参加重要的工作会议或只是想看电影时。
Mac 上与音频相关的复杂问题(Audio-related complications on Mac)既容易修复，也可能难以修复，具体取决于您是否知道在哪里查看。如果这是您第一次在Mac上遇到声音无法正常工作，或者您已尝试修复音频故障但无济于事，请参阅以下故障排除步骤以使Mac的声音再次正常工作。
1. 检查 Mac 的扬声器音量
如果您的Mac没有产生音频，您的步骤应该是确保输出音量没有静音或处于最低级别。轻点键盘上的提高音量按钮以取消Mac静音。如果您的Mac配备触控栏(Touch Bar)，请将扬声器图标向右滑动以增加输出音量。
或者，转到系统偏好设置(System Preferences)>声音(Sound)>输出(Output)，然后取消选中输出(Output)音量滑块旁边的静音选项。(Mute)
2.选择合适的音频设备
macOS 一次只能将声音传输到一台音频设备。如果您的Mac自动连接到附近的蓝牙(Bluetooth)音频设备，可能在您不知情的情况下，它会将声音输出传送到该设备。
转到系统偏好设置(System Preference)>蓝牙(Bluetooth)以断开任何不需要的设备。您还可以禁用蓝牙(Bluetooth)，这样您的Mac就不会与设备重新建立连接。
如果您不想移除蓝牙(Bluetooth)设备或禁用蓝牙(Bluetooth)，请前往 Mac 的声音设置并选择您喜欢的设备作为声音输出的主要设备。转到设置(Settings)>声音(Sound)>输出(Output)，然后从列表中选择您喜欢的设备。
如果所选设备上仍然没有声音输出，并且您确定它没有静音，请断开其他音频设备并重试。
3.检查应用内音频输出
某些应用程序具有独立于系统范围音量的单独音量控制。播客(Podcasts)和音乐(Music)应用程序就是很好的例子。在Mac上启动Apple Music ，您会在应用程序的右上角找到一个专用的音量滑块。
静音 Apple Music 的音量将阻止应用程序将音频传输到您的扬声器、耳机或其他连接的音频设备——即使系统范围的音量为 100%。
在浏览器上流式传输内容时，声音是否在Mac上不起作用？(Mac)检查您是否没有将托管网页的标签静音；打叉的扬声器图标表示静音选项卡。右键单击选项卡并选择取消静音选项卡(Unmute Tab)选项。
还有一件事：确保网站的媒体播放器没有静音。如果媒体播放器中的扬声器图标被划掉，请单击该图标以取消静音。
基本上，如果声音问题只影响单个应用程序，请检查应用程序的音量设置并确保它没有被静音。
4.外部音频(Troubleshoot External Audio)设备故障排除
某些音频设备（尤其是游戏耳机(gaming headphones)）具有专用的静音按钮和音量控制。如果您的Mac中插入了其中一个，请检查设备并检查您是否没有意外按下静音按钮。
电缆连接故障或松动可能是Mac(Mac)无法将音频传输到外部音频设备的另一个原因。如果您使用的是有线耳机和扬声器，请确保连接线完好无损并牢固地插入Mac的音频插孔或USB端口。
对于没有声音产生的无线音频设备，请禁用Mac的蓝牙(Bluetooth)并重新打开。您也可以在将设备重新连接到Mac(Mac)之前尝试重新启动设备。
如果蓝牙设备虽然是(Bluetooth)Mac上的主要音频设备，但仍无法播放声音，请将其连接到另一台设备（最好是另一台Mac）并(Mac—and)查看它是否正常工作。这将帮助您确定问题的根源：您的Mac或音频设备。
5.重启酷睿音频
Core Audio是Mac中为声音输出和输入提供动力的组件。如果您的Mac在尝试上述所有解决方案后仍无法产生音频，则重新启动Core Audio组件可能会解决问题。
启动Activity Monitor，在搜索栏中输入 coreaudio，然后在搜索结果中双击coreaudio。
在 coreaudio 窗口中，单击退出(Quit)。
单击强制退出(Force Quit)以终止 Core Audio。
macOS 将自动重新启动该过程并希望在您的Mac上恢复声音输出。
您还可以通过在终端(Terminal)中粘贴以下命令并按Enter来重新启动(Enter)Core Audio组件。
sudo killall coreaudiod
输入 Mac 的密码，然后按Enter继续。
6.重新启动Mac
一个简单的设备重启就可以修复干扰Mac(Mac)音频功能的各种临时故障。如果到目前为止您执行的所有故障排除步骤都被证明无效，请关闭您的Mac并重新打开它。
7. 重置 NVRAM 或 PRAM
当您修改Mac的声音设置时，所做的更改会保存在一个名为非易失性随机存取存储器(Random Access Memory)( NVRAM ) 的组件中。如果此内存损坏，某些与声音相关的功能可能无法在您的Mac上正常工作。
重置 NVRAM(Resetting the NVRAM)可以消除导致Mac停止播放音频的故障，尤其是在每次关闭或重新启动Mac时都会出现问题时。要执行NVRAM重置，请关闭Mac并等待它完全关闭。
按下(Press)电源按钮并立即按住以下键：Option + Command + P + R。当您的 Mac 第二次启动或Apple标志重新出现在屏幕上时，请在 20 秒后松开按键。
让 Mac 的音频再次正常工作
如果这些故障排除步骤均无法恢复 Mac 的音频，请联系 Apple 支持(contact Apple Support)或访问授权的Apple 服务中心(Apple Service Center)，检查您的设备是否存在潜在的硬件损坏。
Sound Not Working on Mac? 7 Ways to Fix
Does yoυr Mac fail to produce sound eіther through the built-in speakers оr external audio devices? That can be frustrating, especially if you need to join an important work meeting or simply wаnt to watch a movie.
Audio-related complications on Mac can be both easy and difficult to fix, depending on whether you know where to look or not. If this is the first time you’re experiencing the sound not working on your Mac, or you’ve tried to fix the audio malfunction but to no avail, refer to the troubleshooting steps below to get your Mac’s sound working again.
1. Check Your Mac’s Speaker Volume
If your Mac isn’t producing audio, your step should be to ensure that the output volume isn’t muted or on the lowest level. Tap the volume up button on the keyboard to unmute your Mac. If your Mac has a Touch Bar, slide the speaker icon to the right to increase output volume.
Alternatively, go to System Preferences > Sound > Output and uncheck the Mute option next to the Output volume slider.
2. Choose the Right Audio Device
macOS can only transmit sound to one audio device at a time. If your Mac automatically connects to a nearby Bluetooth audio device, perhaps without your knowledge, it’ll channel sound output to that device.
Go to System Preference > Bluetooth to disconnect any unwanted device. You could also disable Bluetooth so that your Mac doesn’t re-establish a connection with the device.
If you’d rather not remove the Bluetooth device or disable Bluetooth, head to your Mac’s sound settings and select your preferred device as the primary device for sound output. Go to Settings > Sound > Output and select your preferred device from the list.
If there’s still no sound output on the selected device, and you’re sure it isn’t muted, disconnect other audio devices and try again.
3. Check In-App Audio Output
Some applications have their individual volume control that’s independent of the system-wide volume. The Podcasts and Music apps are great examples. Launch Apple Music on your Mac and you’ll find a dedicated volume slider at the top-right corner of the app.
Muting Apple Music’s volume will stop the app from transmitting audio to your speakers, headphones, or other connected audio devices—even if the system-wide volume is 100%.
Is the sound not working on your Mac while streaming content on a browser? Check that you haven’t muted the tab hosting the webpage; a crossed-out speaker icon indicates a muted tab. Right-click the tab and select the Unmute Tab option.
One more thing: make sure the website’s media player isn’t muted. If the speaker icon in the media player is crossed-out, click the icon to unmute the volume.
Basically, if the sound issue only affects a single application, inspect the app’s volume settings and make sure it isn’t muted.
4. Troubleshoot External Audio Devices
Some audio devices (particularly gaming headphones) have dedicated mute buttons and volume controls. If you have one of those plugged into your Mac, inspect the device and check that you haven’t pressed the mute button by accident.
A faulty or loose cable connection could be another reason why your Mac isn’t transmitting audio to your external audio device. If you’re using a wired headphone and speaker, ensure that the cable is in food condition and tightly fitted into your Mac’s audio jack or USB port.
For wireless audio devices with no sound production, disable your Mac’s Bluetooth and turn it back on. You could also try power-cycling the device before reconnecting it to your Mac.
If the Bluetooth device still doesn’t play sound despite being the primary audio device on your Mac, connect it to another device—preferably another Mac—and see if it works. That’ll help you determine the source of the problem: your Mac or the audio device.
5. Restart Core Audio
Core Audio is the component of your Mac that powers sound output and input. If your Mac still won’t produce audio after trying all the solutions above, restarting the Core Audio component may resolve the problem.
Launch the Activity Monitor, type coreaudio in the search bar, and double-click coreaudio in the search result.
In the coreaudio window, click Quit.
Click Force Quit to kill Core Audio.
macOS will automatically restart the process and hopefully restore sound output on your Mac.
You can also restart the Core Audio component by pasting the command below in Terminal and pressing Enter.
sudo killall coreaudiod
Enter your Mac’s password and press Enter to proceed.
6. Reboot the Mac
A simple device restart can fix all sorts of temporary glitches disrupting your Mac‘s audio functionality. If all the troubleshooting steps you’ve taken so far proved abortive, shut down your Mac and turn it back on.
7. Reset NVRAM or PRAM
When you modify your Mac’s sound settings, the changes are saved in a component called the Non-Volatile Random Access Memory (NVRAM). Should this memory become corrupt, some sound-related functionality may fail to work correctly on your Mac.
Resetting the NVRAM can eliminate glitches causing your Mac to stop playing audio, especially if the problem occurs every time you shut down or reboot your Mac. To perform an NVRAM reset, power off your Mac and wait for it to shut down completely.
Press the power button and hold the following keys immediately: Option + Command + P + R. Release the keys after 20 seconds when your Mac starts up for the second time, or when the Apple logo reappears on the screen.
Get Your Mac’s Audio Working Again
If none of these troubleshooting steps restores your Mac’s audio, contact Apple Support or visit an authorized Apple Service Center to get your device examined for potential hardware damage.
