Reset SMC 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


  1. Nice post. I learn something new and challenging on sites I stumbleupon every day.
    It’s always useful to read through articles from other authors and use something from their web sites.

  2. Hi there! Do you know if they make any plugins to protect against
    hackers? I’m kinda paranoid about losing everything I’ve
    worked hard on. Any recommendations?

  3. 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.

  4. Battery Health was telling me there was no battery detected in my MacBook Pro, the MacBook Pro was telling me I had no lighted keyboard connected, and my fan was running at full speed from startup. The advice in this article on restarting SMC cured all my problems. Great advice, thank you!

  5. I’m very happy to find this website. I want to to thank you for ones time due to this fantastic read!!

    I definitely savored every part of it and i also have you book-marked
    to see new stuff on your site.

  6. It’s a pity you don’t have a donate button! I’d definitely donate to this fantastic blog!
    I suppose for now i’ll settle for bookmarking and adding your RSS feed to my Google account.

    I look forward to fresh updates and will share this blog with my Facebook group.
    Chat soon!

    • Hi Jens, thanks for your comment! Actually you’ll be surprised to learn that none of these comments were made by us. This is one of our most visited posts on this site so, although it may seem a bit fake, these comments were made by real readers. If you have any feedback for us, we’re welcome to take it on board!


Please enter your comment!
Please enter your name here

This site uses Akismet to reduce spam. Learn how your comment data is processed.