How to Reset SMC on a Mac

If you’re having trouble with your Mac, and a PRAM reset hasn’t worked, you may need to try reset SMC (System Management Controller) on your Mac.

Why you should Reset SMC on your Mac

Fans —The computer’s fans run at high speed although the computer is not experiencing heavy usage and is properly ventilated.

Lights — Keyboard backlight not working correctly, Status Indicator Light (SIL) not working correctly, battery indicator lights behaving incorrectly, display backlight doesn’t respond to ambient light changes (on Macs with this feature)

Power — No response when pressing the power button, a portable Mac doesn’t respond when closing/opening the lid, unexpected shutdown/sleep, battery not charging properly, MagSafe power adapter LED not indicating the correct activity

System Performance — Slow performance, apps taking a long time to open, apps not responding after being opened

Video — Macs that support target display mode not working as expected

Reset the SMC of a MacBook or MacBook Pro’s with detachable batteries:

  • Shutdown your MacBook/Pro and remove the battery
  • Disconnect the power adapter, hold the Power Key for 10 seconds
  • Release the power key and reconnect your battery and power adapter
  • Turn your Mac on
  • Let boot as usual

Reset SMC of a MacBook or MacBook Pro’s with an internal battery:

  • Shutdown your MacBook/Pro
  • Connect the power adapter to your Mac
  • On the MacBook/Pro’s keyboard, hold down the Shift+Control+Option keys and the Power button at the same time
  • Release all keys and the power button simultaneously
  • Boot your Mac as usual

Reset SMC of an iMac, Mac Pro, Mac Mini:

  • Shut down your Mac
  • Disconnect the power cord
  • Press and hold the Mac’s power button for 5 seconds
  • Release the button
  • Reconnect the power cables and boot your Mac as usual

5 Comments on "How to Reset SMC on a Mac"

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  4. Byron Youngblood | March 26, 2016 at 3:33 pm | Reply

    How do I tell if the. SMC reset worked?

  5. Tony Buitrago | April 14, 2016 at 5:40 am | Reply

    I want to thank you. These fans were always on and I was really worried. They seem fine now.
    I would also like to ask have you run across any problems when putting the OS to El Capitan, about using external hard drives. all my hard drives are now read only when before the were read write.

    Thank you again.

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