Reset the SMC of your Mac

The SMC is responsible for managing power on your Mac. Resetting it can resolve certain uncommon issues related to power or thermal management.

Do you need to reset the SMC?

You almost certainly don’t need to reset the SMC, but resetting the SMC may be suggested for Intel-based Mac computers as a final step to resolve issues that could be power related:

• Battery isn't charging

• Mac isn't turning on

• Fans are running fast

• Mac laptop computer gets too warm

• Built-in camera isn't working

If your Mac is experiencing one of these issues, follow the steps in this article for your Mac model:

Mac with Apple silicon

Mac with Apple T2 Security Chip

All other Mac models

If you have Mac with Apple silicon

Find out if you have a Mac with Apple silicon

Make sure your Mac is plugged in to a power source, then complete one of these actions.

• Restart: Choose Apple menu  > Restart.

• Or shut down: Choose Apple menu  > Shut Down. Then press the power button on your Mac to turn it on again.

No other steps are necessary for Mac computers with Apple silicon.

If you have a Mac with the Apple T2 chip

Find out if you have a Mac with the Apple T2 Security Chip

Laptop computer with the T2 chip

Before resetting the SMC, follow these steps:

1. Shut down your Mac, if possible.

2. Press and hold the power button for 10 seconds, then release the button. (Every Mac has a power button. On laptop computers that have Touch ID, press and hold Touch ID.)

3. Wait a few seconds, then press the power button to turn on your Mac.

If the issue persists, reset the SMC:

1. Shut down your Mac.

2. On your built-in keyboard, press and hold all of the following keys. Your Mac may turn on.

   • Control on the left-hand side of your keyboard

   • Option (Alt) on the left-hand side of your keyboard

   • Shift on the right-hand side of your keyboard

3. Keep holding all three keys for 7 seconds, then press and hold the power button as well. If your Mac is turned on, it will turn off while you're holding these keys.

   

4. Keep holding all four keys for another 7 seconds, then release them.

5. Wait a few seconds, then press the power button to turn on your Mac.

Desktop computer with the T2 chip

If your Mac isn't a laptop computer, follow these steps:

1. Shut down your Mac, then unplug the power cable.

2. Wait 15 seconds, then plug the power cable back in.

3. Wait 5 seconds, then press the power button to turn on your Mac.

If you don't have a Mac with Apple silicon or the T2 chip

Follow these steps on older computers that have neither Apple silicon nor the Apple T2 Security Chip.

Laptop computer

1. Shut down your Mac.

2. On your built-in keyboard, press and hold all of these keys:

   • Shift on the left-hand side of your keyboard

   • Control on the left-hand side of your keyboard

   • Option (Alt) on the left-hand side of your keyboard

3. While holding all three keys, press and hold the power button as well.

   

4. Keep holding all four keys for 10 seconds.

5. Release all keys, then press the power button to turn on your Mac.

Desktop computer

If your Mac isn't a laptop computer, follow these steps:

1. Shut down your Mac, then unplug the power cable.

2. Wait 15 seconds, then plug the power cable back in.

3. Wait 5 seconds, then press the power button to turn on your Mac.