The System Management Controller (SMC) controls a number of Mac core functions. The SMC is hardware that is incorporated into the Mac's motherboard. Its purpose is to free the Mac's processor from having to take care of rudimentary hardware functions. With many core tasks performed by the SMC, it is no wonder that resetting the SMC to its default state can fix problems.
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- How to reset the SMC on a Mac that has the Apple T2 chip. Choose Apple menu Shut Down. After your Mac shuts down, press and hold its power button for 8 seconds. Release the power button, then wait a few seconds. Press the power button again to turn on your Mac.
Nov 08, 2018 Reset NVRAM or PRAM on your Mac If your Mac has issues related to settings stored in NVRAM or PRAM, resetting it might help. NVRAM (nonvolatile random-access memory) is a small amount of memory that your Mac uses to store certain settings and access them quickly.
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What the SMC Controls
The SMC performs the following functions, which vary by Mac model:
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- Responds to the press of the power button, including deciding whether the press is for a power off, sleep, or caused an accidental misstep by your cat
- Detects and responds to the opening or closing of the lid of a portable Mac
- Manages a portable's battery performance, including charging, calibration, and displaying remaining battery time
- Handles the thermal management of the Mac's interior by sensing the temperature at various places inside the Mac and then adjusting fan speed to create or reduce airflow
- Uses the Sudden Motion Sensor to respond to the sudden motion of a Mac laptop and acts to prevent damage
- Detects ambient lighting conditions and sets appropriate lighting levels for devices
- Controls keyboard backlighting
- Controls built-in display backlighting
- Controls the status indicator lights that are present on or in the Mac
- Selects external or internal video sources on iMacs with video input capabilities
- Starts hard drive spin-downs and power-up sequences
- Controls sleep mode functions
- Controls trackpad functions for Mac models with trackpads
Signs You Need to Reset the SMC
Resetting the SMC is not a cure-all, but it fixes many symptoms a Mac may suffer from, including:
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- Erratic sleep mode performance, including not waking from or not entering sleep
- Entering sleep unexpectedly, even while you are actively working on it
- Mac laptops not responding to lid opening or closing
- Failure to respond to the power button being pressed
- Power indicator not displaying or displaying incorrectly
- Sluggish performance, even when the Activity Monitor shows little CPU usage
- Target Display Mode not working correctly
- Battery not charging or taking excessive time to charge
- USB ports not working
- Wi-Fi hardware reported as missing or not working
- Bluetooth not working
- Fans running too rapidly
- Display backlight not responding to ambient light-level changes
- Status indicator lights not working correctly or stuck in a static state
- Bouncing Dock icons that keep bouncing without the associated app launching
- Mac Pro (2013) port illumination fails to turn on or off
How to Reset Your Mac's SMC
The method for resetting your Mac's SMC depends on the type of Mac you have. All SMC reset instructions require shutting down your Mac first. If your Mac fails to shut down, press and hold the power button until the Mac shuts down, which usually takes 10 seconds or so.
Reset Mac Notebooks With User-Removable Batteries
- Shut down the Mac.
- Remove the battery.
- Press and hold the power button for at least five seconds.
- Release the power button.
- Reinstall the battery.
- Turn on the Mac.
Reset Mac Notebooks Without User-Removable Batteries
- Shut down the Mac.
- On the built-in keyboard (this does not work from an external keyboard), simultaneously press and hold the left Shift, Control, and Option keys while you press the power button for at least 10 seconds. (If you have a MacBook Pro with Touch ID, the Touch ID button is also the power button.) Release all keys at the same time.
- Press the power button to start the Mac.
Reset Mac Desktops and Notebooks With the Apple T2 Chip
If you have an iMac Pro or MacBook Pro model from 2018 with the Apple T2 chip:
- Shut down the Mac.
- Press and hold the power button for 10 seconds.
- Release the power button and wait a few seconds.
- Press the power button again to turn on the Mac.
As an alternative for the iMac Pro with T2 chip, you can:
- Shut down the Mac.
- Unplug the power cord.
- Wait 15 seconds.
- Plug in the power cord.
- Wait five seconds.
- Press the power button to turn on the Mac.
As an alternative for the MacBook Pro with T2 chip:
- Shut down the Mac.
- Press and hold the right Shift key, the left Option key, and the left Control key for seven seconds. Continue to hold them down while you press the power button for another seven seconds.
- Release all the keys at the same time.
- Press the power button to turn on the Mac.
Mac Desktops (Mac Pro, iMac, Mac mini)
- Shut down the Mac.
- Unplug the Mac's power cord.
- Wait 15 seconds.
- Reconnect the Mac's power cord.
- Wait five seconds.
- Start your Mac by pressing the power button.
Alternative SMC Reset for Mac Pro (2012 and Earlier)
If you have a 2012 or earlier Mac Pro that isn't responding to the normal SMC reset, you can force a manual SMC reset by using the SMC reset button located on the Mac Pro's motherboard.
- Shut down the Mac.
- Unplug the Mac's power cord.
- Open the Mac Pro's side access panel.
- Just below the Drive 4 sled and adjacent to the top PCI-e slot is a small button labeled SMC. Press and hold this button for 10 seconds.
- Close the Mac Pro's side door.
- Reconnect the Mac's power cord.
- Wait five seconds.
- Start the Mac by pressing the power button.
Now that you have reset the SMC on your Mac, it should be back to operating as you expect. If the SMC reset didn't fix your problems, combine it with a PRAM reset. Although the PRAM works differently than the SMC, it can store a few bits of information that the SMC uses.
If you're still having problems, run the Apple Hardware Test to rule out a defective component on your Mac.
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What the SMC does
The SMC is responsible for these and other low-level functions on Intel-based Mac computers:
- Responding to presses of the power button
- Responding to the display lid opening and closing on Mac notebooks
- Battery management
- Thermal management
- Sudden Motion Sensor (SMS)
- Ambient light sensing
- Keyboard backlighting
- Status indicator light (SIL) management
- Battery status indicator lights
- Selecting an external (instead of internal) video source for some iMac displays
How to know if you need to reset the SMC
These symptoms might mean that an SMC reset is necessary:
- Your computer's fans run at high speed, even though it isn't under heavy usage and is properly ventilated.
- The keyboard backlight behaves incorrectly.
- The status indicator light, if present, behaves incorrectly.
- Battery indicator lights, if present, behave incorrectly on Mac notebooks with a non-removable battery.
- The display backlight doesn't respond correctly to ambient light changes.
- Your Mac doesn't respond when you press the power button.
- Your Mac notebook doesn't respond properly when you close or open the lid.
- Your Mac sleeps or shuts down unexpectedly and you can't turn it back on.
- The battery doesn't charge properly.
- Your MacBook or MacBook Pro doesn't charge through its built-in USB-C port.
- Your MacBook or MacBook Pro doesn't recognize external devices that are connected to its built-in USB-C port.
- The MagSafe power adapter LED, if present, doesn't indicate the correct charging activity.
- Your Mac performs unusually slowly, even though its CPU isn't under an abnormally heavy load.
- A Mac that supports target display mode doesn't switch into or out of target display mode as expected, or it switches into or out of target display mode at unexpected times.
- The illumination around the I/O ports on a Mac Pro (Late 2013) doesn't turn on when you move the computer.
Before you reset the SMC
Try each of these steps in this order before you reset the SMC. Test the issue after each step to see if the issue still occurs.
- If your Mac isn't responding, press and hold the power button until it shuts down. You'll lose unsaved work in any open applications. Then press the power button again to turn on your Mac.
- Press Command-Option*-Escape to force quit any application that's not responding.
- Put your Mac to sleep by choosing Apple () menu > Sleep. Wake the computer after it's gone to sleep.
- Restart your Mac by choosing Apple menu > Restart.
- Shut down your Mac by choosing Apple menu > Shut Down, then press the power button again to turn on your Mac.
If you're using a Mac notebook that's having power or battery issues, follow these steps:
- Unplug the power adapter from your Mac and the electrical outlet for several seconds, then plug it back in.
- Choose Apple menu > Shut Down and wait for your Mac to shut down.
- Remove and re-insert the battery if it's removable.
- Press the power button again to turn on your Mac.
If the issue still isn't resolved, you might need to reset the SMC using the steps below.
* On some keyboards, the Option key is also labeled Alt.
How to reset the SMC on Mac notebooks
If your Mac notebook has the Apple T2 Security Chip, skip ahead to the T2 section. Create manual route mac os.
To reset the SMC on a Mac notebook, first determine whether the battery is removable. Most older Mac notebooks have removable batteries. Mac notebooks that have nonremovable batteries include MacBook Pro (Early 2009 and later), all models of MacBook Air, MacBook (Late 2009), and MacBook (Retina, 12-inch, Early 2015 and later). Learn more about Mac notebook batteries.
If the battery is nonremovable:
- Choose Apple menu > Shut Down and wait for your Mac to shut down.
- Press Shift-Control-Option on the left side of the built-in keyboard, then press the power button at the same time. Hold these keys and the power button for 10 seconds. If you have a MacBook Pro with Touch ID, the Touch ID button is also the power button.
- Release all keys.
- Press the power button again to turn on your Mac.
If the battery is removable:
- Shut down your Mac.
- Remove the battery. If you need help removing the battery, contact an Apple Authorized Service Provider or Apple Retail Store.
- Press and hold the power button for 5 seconds.
- Reinstall the battery.
- Press the power button again to turn on your Mac.
How to reset the SMC on Mac desktop computers
If your Mac desktop computer has the Apple T2 Security Chip, skip ahead to the T2 section. https://ameblo.jp/primtermoge1983/entry-12639849565.html.
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Follow these steps for iMac, Mac mini, Mac Pro, and Xserve.
- Choose Apple menu > Shut Down and wait for your Mac to shut down.
- Unplug the power cord.
- Wait 15 seconds.
- Plug the power cord back in.
- Wait 5 seconds, then press the power button again to turn on your Mac.
For Intel-based Xserve computers that aren't responding, you can shut down locally or by using remote commands. You can also press and hold the power button for 5 seconds.
How to reset the SMC on a Mac that has the Apple T2 Security Chip
Follow these instructions for Mac computers that have the Apple T2 Security Chip.
Manually Reset Wacom
Mac desktop computers with the T2 chip
Try this first:
- Choose Apple menu > Shut Down and wait for your Mac to shut down.
- Press and hold its power button for 10 seconds.
- Release the power button, then wait a few seconds.
- Press the power button again to turn on your Mac.
Manual Reset Macbook Air
If that doesn't resolve the issue, follow these steps:
- Choose Apple menu > Shut Down and wait for your Mac to shut down.
- Unplug the power cord.
- Wait 15 seconds.
- Plug the power cord back in.
- Wait 5 seconds, then press the power button again to turn on your Mac.
Mac notebook computers with the T2 chip
Try this first:
Restart Mac
- Choose Apple menu > Shut Down and wait for your Mac to shut down.
- Press and hold the power button for 10 seconds.
- Release the power button, then wait a few seconds.
- Press the power button again to turn on your Mac.
If that doesn't resolve the issue, follow these steps:
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- Choose Apple menu > Shut Down and wait for your Mac to shut down.
- Press and hold the right Shift key, the left Option key, and the left Control key for 7 seconds. Your Mac might turn on and show the Apple logo on its display. Keep holding those keys while you also press and hold the power button for another 7 seconds. If your Mac turned on when you first pressed the keys, it turns off at this point.
- Release all three keys and the power button, then wait a few seconds.
- Press the power button again to turn on your Mac.
Learn more
Resetting the SMC doesn't reset or otherwise change the contents of NVRAM or PRAM on Intel-based Mac models.
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