Reset the SMC on computers that have the T2 chip
Install in the typical Mac fashion, by dragging the icon to your Applications folder. Close the application you want to reset (we’ll use Twitter as an example), then open AppCleaner. Click the button at top-right to see your list of installed applications. Find the program you want to delete settings for, by searching or scrolling. The Uninstaller feature allows you to delete apps from your Mac and remove their traces. It doesn’t list pre-installed apps from Apple, such as Safari or Calendar, but it shows every app you have installed on your Mac. Surely, you can clean up your Mac manually, but using dedicated software will save you tons of time. Price: $29 per year.
If your Mac has the Apple T2 Security Chip, follow these steps. If you need help, contact Apple Support.
Notebook computers with the T2 chip
Before resetting the SMC, try these steps:
- Shut down your Mac.
- Press and hold the power button for 10 seconds, then release the button.
- Wait a few seconds, then press the power button to turn on your Mac.
If the issue persists, follow these steps to reset the SMC:
- Shut down your Mac.
- On your built-in keyboard, press and hold all of the following keys. Your Mac might turn on.
- Control on the left side of your keyboard
- Option (Alt) on the left side of your keyboard
- Shift on the right side of your keyboard
- Keep holding all three keys for 7 seconds, then press and hold the power button as well. If your Mac is on, it will turn off as you hold the keys.
- Keep holding all four keys for another 7 seconds, then release them.
- Wait a few seconds, then press the power button to turn on your Mac.
Desktop computers with the T2 chip
- Shut down your Mac, then unplug the power cord.
- Wait 15 seconds, then plug the power cord back in.
- Wait 5 seconds, then press the power button to turn on your Mac.
Reset the SMC on other computers
If your Mac doesn't have the Apple T2 Security Chip, follow these steps. If you need help, contact Apple Support.
Notebook computers with a nonremovable battery
This applies to MacBook Pro models introduced in mid-2009 through 2017, MacBook Air models introduced in 2017 or earlier, and all MacBook models except the MacBook (13-inch, Mid 2009).
- Shut down your Mac.
- On your built-in keyboard, press and hold all of these keys:
- Shift on the left side of your keyboard
- Control on the left side of your keyboard
- Option (Alt) on the left side of your keyboard
- While holding all three keys, press and hold the power button as well.
- Keep holding all four keys for 10 seconds.
- Release all keys, then press the power button to turn on your Mac.
Notebook computers with a battery that can be removed
This applies to all MacBook Pro and MacBook models introduced in early 2009 or earlier, as well as the MacBook (13-inch, Mid 2009).
- Shut down your Mac.
- Remove the battery. (If you need help removing it, contact an Apple Store or Apple Authorized Service Provider.)
- Press and hold the power button for 5 seconds.
- Reinstall the battery.
- Press the power button to turn on your Mac.
Desktop computers
- Shut down your Mac, then unplug the power cord.
- Wait 15 seconds, then plug the power cord back in.
- Wait 5 seconds, then press the power button to turn on your Mac.
About the SMC
The system management controller is responsible for managing behaviors related to these features:
- Power, including the power button and power to the USB ports
- Battery and charging
- Fans and other thermal-management features
- Indicators or sensors such as status indicator lights (sleep status, battery charging status, and others), the sudden motion sensor, the ambient light sensor, and keyboard backlighting
- Behavior when opening and closing the lid of a notebook computer
Resetting the SMC doesn't affect the contents of NVRAM or PRAM.
NVRAM (nonvolatile random-access memory) is a small amount of memory that your Mac uses to store certain settings and access them quickly. PRAM (Parameter RAM) stores similar information, and the steps for resetting NVRAM and PRAM are the same.
Settings that can be stored in NVRAM include sound volume, display resolution, startup-disk selection, time zone, and recent kernel panic information. The settings stored in NVRAM depend on your Mac and the devices that you're using with your Mac.
If you experience issues related to these settings or others, resetting NVRAM might help. For example, if your Mac starts up from a disk other than the one selected in Startup Disk preferences, or a question mark icon briefly appears before your Mac starts up, you might need to reset NVRAM.
How to reset NVRAM
Shut down your Mac, then turn it on and immediately press and hold these four keys together: Option, Command, P, and R. You can release the keys after about 20 seconds, during which your Mac might appear to restart.
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- On Mac computers that play a startup sound, you can release the keys after the second startup sound.
- On Mac computers that have the Apple T2 Security Chip, you can release the keys after the Apple logo appears and disappears for the second time.
If your Mac is using a firmware password, this key combination does nothing or causes your Mac to start up from macOS Recovery. To reset NVRAM, first turn off the firmware password.
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When your Mac finishes starting up, you might want to open System Preferences and adjust any settings that were reset, such as sound volume, display resolution, startup disk selection, or time zone. Remote desktop manager enterprise 6 2 0 0 windows 10.
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- If you're using a desktop Mac instead of a notebook, and settings such as sound volume or time zone are reset every time you shut down and unplug your Mac, you might need to replace the battery inside your Mac. This small battery is on your computer's logic board, and it helps NVRAM retain settings when your Mac is unplugged. You can take your Mac to an Apple service provider to replace the battery.
- If you experience issues with sleep, wake, power, charging your Mac notebook battery, or other power-related symptoms, you might need to reset the SMC (System Management Controller).