Performing a SMC Reset on Mac has the potential to fix problems related to Power supply, Fans, Lights and also some performance related issues. Hence, let us take a look at What is SMC, When to Reset SMC and the Steps to Reset SMC on Mac.
What is SMC
The System Management Controller (SMC) is a circuit or a chip on the logic board of your Mac that deals with the Management of Power supply, Temperature Management, Fan speed control, Status Lights, Keyboard backlights, Video Mode switching and some other components on your Mac.
On some occasions the SMC can become confused or corrupted leading to problems that can be fixed by performing SMC Reset on a Mac.
When to Reset SMC on Mac
According to Apple, you should not Reset SMC on Mac without first trying to fix the problem by using standard troubleshooting methods like force-quitting stuck apps and trying to restart your Mac.
This advice holds true most of the time, as non-software related issues like change in display resolution of a Mac, lights not working, Volume settings on Mac getting stuck and such other problems can be fixed by closing down all the apps and restarting the Mac.
However, sometimes these troubleshooting methods do not work, leaving you with the option to reset SMC on your Mac and see if this can fix the problem.
In general, SMC Reset can help in fixing the following problems on your Mac.
Power Supply Related Problems – MacBook not turning ON, Battery Not Charging, Battery Indicator Light Not Working. Keyboard Backlight Not Working, Mac Not waking up from sleep mode, Mac shutting down abruptly
Cooling System Problems – Fans running at high speed or Fans not working at all on Mac
Display Problems – External Display connected to Mac not working, videos not playing on Mac, or a change in Display brightness on Mac’s screen.
Devices & Ports – Ports not working, external devices connected to Mac not working, track pad not working, keyboard not responding normally or mouse behaving abnormally
Performance Related Issues – Mac suffering from Slow or sluggish performance even under low CPU load, Bluetooth not working, Mac not connecting to WiFi, application icons bouncing in the Dock of Mac for an extended period of time.
Steps to Rest SMC on Mac
There are different ways to Reset SMC on Mac, depending on the version of your Mac. We are providing below the steps to Reset Various models of Mac.
Reset SMC On MacBook Air, MacBook Pro & MacBook Pro Retina.
Follow the steps below to Reset SMC on the newer versions of MacBook Air, MacBook Pro and MacBook Pro Retina models with Non Removable batteries.
1. First Shutdown your MacBook Air, MacBook Pro or MacBook Pro with Retina display.
2. Unplug the MagSafe, USB-C or the power cable from your Mac.
3. Next, Hold down Shift+Control+Option keys and then Press and Hold down the Power button at the same time on the keyboard of your Mac.
Note: In case you have a 2016 MacBook Pro with Touch ID, the Touch ID button is also its Power button (See image below).
4. After 10 seconds, release All the Keys at the same time.
5. Connect the Mac back to its Power supply cable/Adapter
6. Start your Mac by pressing the Power button.
Note: The boot time of your Mac immediately after SMC Reset can be longer than normal. Also, you will be losing power related settings on your Mac, like the time it takes for the Mac to go into sleep mode.
Reset SMC On iMac, Mac Mini and Mac Pro
Follow the steps below to Reset SMC on desktop versions of Macs like iMac, Mac Mini and Mac Pro.
1. Shut down the Mac and Unplug the Power Cord, both from Mac and the wall outlet
2. Wait for 15 seconds
3. Plug the Power Cord back into your Mac and the Wall socket
4. Wait for 5 seconds
5. Press on the Power button to restart your Mac.
Reset SMC On MacBook with Removable Batteries
Follow the steps below to Reset SMC on older MacBook models (Mid 2009 or older) with removable batteries.
1. Shutdown your MacBook, unplug its power supply cable and remove the battery from your MacBook
2. Next, Press and hold down the Power Key for about 10 seconds
3. Release the Power key
4. Insert the Battery back into your Mac and plug back its Power supply cable
5. Next, turn ON your Mac as usual.
Image source: Apple