在Mac^(Mac)上处理严重问题可能会令人沮丧，尤其是当它们突然出现时。从充电问题、过热问题到启动错误，这些问题可能会对您的工作流程造成严重破坏。但有一个解决方案可以让您免去Apple^(Apple) Store零售店的麻烦：重置Mac的SMC（系统管理控制器）^{(System Management Controller)}。

在本教程中，我们将解释SMC重置的作用以及它如何帮助修复您的Mac。无论^(Whether)您遇到电池、风扇速度还是其他硬件功能问题，重置SMC都是一个简单的过程，可以让您的Mac再次正常工作。

为什么应该重置系统管理控制器^{(System Management Controller)}

系统管理控制器^{(System Management Controller)}( SMC ) 是^(SMC)英特尔 Mac^{(Intel Macs)}中不可或缺的组件，负责监督关键的硬件和电源相关功能，例如电池充电、风扇速度和环境光感应。如果您在使用任何这些功能时遇到问题，则可能表明SMC^(SMC)存在潜在问题。

例如，风扇行为异常、电池拒绝充电或蓝牙^(Bluetooth)或Wi-Fi模块无响应都是SMC相关问题的潜在迹象。重置SMC可解决因电源管理设置损坏、过时或冲突而产生的问题。

但是，请务必注意，虽然重置SMC不会导致数据丢失，但您只应在解决问题的适用故障排除方法后将其视为最后的手段。例如，如果您的Mac无缘无故过热，请首先 在安全模式下启动并诊断您的 Mac 。^{(boot into and diagnose your Mac in Safe Mode)}

Apple Silicon Mac^{(Apple Silicon Macs)}（例如基于 M1 的MacBook Air、MacBook Pro和Mac mini）不配备SMC。相反， SMC^(SMC)的功能由CPU本身处理。这意味着没有直接的方法可以重置SMC，但简单的重新启动即可达到相同的效果。

如何在基于 Intel 的 MacBook 上 重置SMC

在具有不可拆卸电池的基于 Intel 的MacBook上重置^(MacBooks)SMC有两种方法，这取决于它是否具有Apple T2 安全芯片^{(Apple T2 Security Chip)}。为了弄清楚这一点：

1. 打开Apple菜单，按住Option键，然后选择“系统信息”^{(System Information)}。
2. 选择侧边栏上的控制器。
3. 检查Apple T2^{(Apple T2)}芯片型号名称^{(Model Name)}旁边的字段。

如果您在启动 macOS 时遇到问题，请找到 Mac 的序列号（您应该在外壳或原始包装的底部找到它）并将其输入Apple 的“检查设备覆盖范围”页面^{(Apple’s Check Device Coverage page)}以识别型号。或者，使用iPhone 或 iPad 上的Apple 支持^{(Apple Support)}应用程序获取详细信息。如果它是2018 年或更高版本的MacBook Pro或MacBook Air，则应配备Apple T2 安全芯片^{(Apple T2 Security Chip)}。

如果您使用旧的Mac笔记本电脑或带有可拆卸电池的笔记本电脑（2008 年或更早的型号），则必须按照不同的步骤重置其SMC。

^{(Reset SMC)}使用Apple T2 安全芯片^{(Apple T2 Security Chip)}重置MacBook上的SMC

1. 关闭^(Shut)Mac并将其与USB-C或^(Mac)MagSafe 电源适配器^{(MagSafe Power Adapter)}断开连接。如果您在关闭设备时遇到问题， 请按住电源按钮以启动强制关机。^(Power)
2. 按住内置键盘上的 左侧Control和Option键以及右侧Shift键 7 秒钟。^(Shift)
3. 按住电源^(Power)按钮而不释放其他键。
4. 继续按住所有四个键 7 秒钟。
5. 按^(Press)电源^(Power)按钮打开Mac。

^{(Reset SMC)}在没有Apple T2 安全芯片的^{(Apple T2 Security Chip)}MacBook上重置 SMC

1. 关闭Mac并将其从充电器上拔下。
2. 按住键盘左侧的 Shift、Option和Control键。^(Control)
3. 按住电源按钮。
4. ^(Release)十秒后 松开所有四个键。
5. 按^(Press)电源^(Power)按钮打开Mac。

^{(Reset SMC)}在配备可拆卸^(Removable)电池 的MacBook上重置 SMC

1. 关闭Mac并断开其与充电器的连接。
2. 打开电池盖并取出电池。
3. 按住电源^(Power)按钮五秒钟。
4. 重新插入电池并盖上盖子。
5. 启动你的 Mac。

如何在台式机 Mac上重置^{(Desktop Mac)}SMC

在台式Mac（iMac、Mac mini或Mac Pro）^{(Mac Pro—follows)}上重置SMC时遵循相同的过程，无论其是否使用Apple T2 安全芯片^{(Apple T2 Security Chip)}。

1. 关闭Mac并拔下电源插头。
2. 等待 15 秒，然后重新连接电源线。
3. 再等待^(Wait)5 秒钟，然后按电源^(Power)按钮启动Mac。

如何重置Apple Silicon Mac^{(Apple Silicon Macs)}上的SMC

如果您使用配备Apple Silicon芯片组（例如Apple M1 或 M2^{(Apple M1 or M2)} ）的Mac，则与系统管理控制器相关的功能将嵌入到微处理器中。关闭并重新启动Mac应该会自动重置它。

如果这无法解决问题，请尝试重新启动 macOS 设备。要做到这一点：

1. 关闭Mac笔记本电脑或台式设备并断开所有电源线。
2. 等待 30 秒。
3. 将Mac^(Mac)重新连接到电源并重新启动机器。

如何在Mac上执行^(Mac)NVRAM或PRAM 重置^{(PRAM Reset)}

基于 Intel 的Mac^(Macs)配备了一个名为NVRAM（非易失性随机存取存储器^{(Random Access Memory)}）的独立硬件组件，它存储与系统软件相关的特定设置和配置，例如启动磁盘选择、屏幕分辨率和时区。除了SMC之外，如果您的 macOS 设备遇到其他问题，您还可以重置它。

注意：在PowerPC^(PowerPC)芯片组上运行的老式Mac^(Macs)将NVRAM称为PRAM（或参数随机存取存储器^{(Parameter Random Access Memory)}）。

要重置 NVRAM：

1. 关闭您的 Mac 计算机。
2. 按住Command、Option、 P 和 R 键。
3. 继续按住所有四个键，直到Mac启动并发出两次提示音。如果您的Mac具有Apple T2 安全芯片^{(Apple T2 Security Chip)}，请等到您第二次 看到Apple徽标。^(Apple)

注意：在Mac桌面设备上，请在启动NVRAM重置之前通过^(NVRAM)USB连接键盘。

NVRAM重置后，打开System Preferences/Settings应用程序并根据需要重新配置显示分辨率、启动磁盘选择、时区首选项等。

但Apple Silicon Mac^{(Apple Silicon Macs)}又如何呢？与SMC^(SMC)一样，您无法在运行 Apple 内部芯片组的 macOS 设备上重置NVRAM 。相反，请关闭并重新启动设备，或通过断开所有电源线重新启动设备。

^{(Troubleshoot Your Mac)}通过SMC 重置^{(SMC Reset)}对 Mac 进行故障排除

SMC重置是一种高级故障排除技术，可以在其他所有方法均失败时使发生故障的Mac^(SMC)恢复^(Mac)运行。此外，NVRAM重置可以帮助修复损坏的系统设置和配置。如果两种方法都无法解决问题， 请联系 Apple 支持或在最近的^{(Contact Apple Support)}Genius Bar预约。

How to Reset Your Mac's System Management Controller (SMC)

Dealing with severe issues on a Mac сan be frustrating, esрecially when they come out of nowhere. From charging problems and overhеating issues to startup errors, these problems can be highly disruptive to your workflow. But there’s a solution that may save you the trip to an Apple Storе: Resetting your Mac’s SMC, or System Management Controller.

Over the course of this tutorial, we’ll explain what an SMC reset does and how it can help fix your Mac. Whether you’re experiencing problems with your battery, fan speeds, or other hardware functions, resetting the SMC is a straightforward process that could get your Mac working correctly again.

Why You Should Reset the System Management Controller

The System Management Controller (SMC) is an integral component in Intel Macs that oversees crucial hardware and power-related functions, such as battery charging, fan speeds, and ambient light sensing. If you experience issues with any of these functionalities, it may indicate an underlying problem with the SMC.

For example, abnormal fan behavior, a battery that refuses to charge, or an unresponsive Bluetooth or Wi-Fi module are all potential signs of SMC-related issues. Resetting the SMC addresses problems that stem from corrupt, obsolete, or conflicting power management settings.

However, it’s important to note that although resetting the SMC does not lead to data loss, you should only consider it as a last-resort measure after working through applicable troubleshooting methods for the issue. For example, if your Mac overheats for no reason, boot into and diagnose your Mac in Safe Mode first.

Apple Silicon Macs (such as the M1-based MacBook Air, MacBook Pro, and Mac mini) do not come with an SMC. Instead, the functions of the SMC are handled by the CPU itself. This means there are no direct means to reset the SMC, but a simple restart achieves the same effect.

How to Reset the SMC on Intel-Based MacBooks

There are two approaches to resetting the SMC on Intel-based MacBooks with non-removable batteries, and that depends on whether it has an Apple T2 Security Chip. To figure that out:

1. Open the Apple menu, hold the Option key, and select System Information.
2. Select Controller on the sidebar.
3. Check the field next to Model Name for Apple T2 chip.

If you have trouble booting into macOS, locate your Mac’s serial number—you should find it on the underside of the casing or original packaging—and enter it into Apple’s Check Device Coverage page to identify the model. Alternatively, use the Apple Support app on an iPhone or iPad to get the details. If it’s a MacBook Pro or MacBook Air from 2018 or later, it should come with an Apple T2 Security Chip.

If you use an old Mac notebook or laptop with a removable battery (a model from 2008 or earlier), you must follow different steps to reset its SMC.

Reset SMC on MacBook With an Apple T2 Security Chip

1. Shut down your Mac and disconnect it from its USB-C or MagSafe Power Adapter. Hold the Power button to initiate a forced shutdown if you have trouble turning off the device.
2. Press and hold the left Control and Option keys and the right Shift key on the built-in keyboard for 7 seconds.
3. Press and hold the Power button without releasing the other keys.
4. Keep holding all four keys for another 7 seconds.
5. Press the Power button to turn on your Mac.

Reset SMC on MacBook Without an Apple T2 Security Chip

1. Turn off your Mac and unplug it from its charger.
2. Hold the Shift, Option, and Control keys on the left side of the keyboard.
3. Hold down the Power button.
4. Release all four keys after ten seconds.
5. Press the Power button to turn on your Mac.

Reset SMC on a MacBook With Removable Batteries

1. Turn off your Mac and disconnect it from its charger.
2. Open the battery cover and take out the battery.
3. Press and hold the Power button for five seconds.
4. Reinsert the battery and replace the cover.
5. Boot up your Mac.

How to Reset the SMC on a Desktop Mac

Resetting the SMC on a desktop Mac—iMac, Mac mini, or Mac Pro—follows the same procedure regardless of whether it uses an Apple T2 Security Chip.

1. Turn off your Mac and unplug it from its power supply.
2. Wait 15 seconds and reconnect the power cord.
3. Wait another 5 seconds and press the Power button to boot up your Mac.

How to Reset the SMC on Apple Silicon Macs

If you use a Mac with an Apple Silicon chipset (e.g., Apple M1 or M2), system management controller-related functions are embedded into the microprocessor. Shutting and restarting the Mac should automatically reset it.

If that does not help fix the problem, try power cycling the macOS device. To do that:

1. Turn off the Mac laptop or desktop device and disconnect all power cables.
2. Wait for 30 seconds.
3. Reconnect the Mac to its power source and reboot the machine.

How to Perform an NVRAM or PRAM Reset on a Mac

Intel-based Macs come with a separate hardware component called the NVRAM (Non-Volatile Random Access Memory), which stores specific settings and configurations related to the system software, such as the startup disk selection, screen resolution, and time zone. Besides the SMC, you can reset it if you encounter additional issues with your macOS device.

Note: Older Macs that run on PowerPC chipsets refer to the NVRAM as the PRAM (or Parameter Random Access Memory).

To reset the NVRAM:

1. Turn off your Mac computer.
2. Press and hold the Command, Option, P, and R keys.
3. Keep holding all four keys until the Mac boots up and chimes twice. If your Mac has an Apple T2 Security Chip, wait until you see the Apple logo for the second time.

Note: On a Mac desktop device, connect your keyboard via USB before initiating an NVRAM reset.

After an NVRAM reset, open the System Preferences/Settings app and reconfigure your display resolution, startup disk selection, time zone preferences, etc., as needed.

But what about Apple Silicon Macs? Like the SMC, you can’t reset the NVRAM on macOS devices running Apple’s in-house chipset. Instead, shut down and reboot the device or power-cycle it by disconnecting all power cables.

Troubleshoot Your Mac With an SMC Reset

An SMC reset is an advanced troubleshooting technique that could get a malfunctioning Mac up and running when all else fails. Additionally, an NVRAM reset can help with corrupt system settings and configurations. Contact Apple Support or book an appointment at the nearest Genius Bar if both methods fail to resolve the issue.

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