Before we see what problems we can solve through reset SMC (System Management Controller), see what does SMC mean? and what does this controller do on desktop computers Mac and on MacBook laptops.
SMC is responsible for a series of functions lower level (low-level) of computers Mac equipped with both Intel, as well as with Apple Silicon.
- responsible for thermal management - accelerates or reduces the rotation speed a Fan fans (fan speed / cooler) depending on the processor load and temperature CPU.
- check ambient light - depending on which automatically sets the brightness displayacquis and turns on or off the keypad light.
- responsive to the motion sensor (Sudden Motion Sensor) - SMS
- the answer Mac when the button is pressed Power - apparently this button is mechanical, but its functions are based on sensors. Especially in the case MacBook ProModel Touch Bar where it plays a role and of sensor for Touch ID. SMC also responsible for the action Mac when the " button is pressedPower". To open, close or put the computer in standby.
- the macbook answer, MacBook Pro or MacBook Air la closing and opening the lid / flaps. Lid.
- battery management - manages energy resources and displays the report for battery status. The load level and the applications that require it the most
- keyboard illumination
- lights indicating the battery status - older models of MacBook laptops that have a button on the left side, which, if pressed, shows the battery charge level, even if the MacBook is closed.
- selecting an external video source (instead of internal) for some display-hate iMac.
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What are the problems of a iMac Pro, Mac, MacBook or MacBook Pro which can be solved by resetting SMC (System Management Controller)
Whereas SMC (System Management Controller) deals with the wide range of sensors and functions of the Mac, resetting it control system is required in situations where:
1. Fans (fan / cooler) run at high speeds (they become noisy in this scenario) at the time the processor is not highly demanded and the ventilation is done properly. References about correct ventilation and optimal temperatures of a MacBook, you can find them here.
2. Keyboard illumination behaves incorrectly. Whether the keypad does not light up when the camera is dark or does not respond to light intensity settings.
3. Battery status light (side leds for models where they exist) behave incorrectly. They do not actually talk about the energy level of the battery or they do not turn on at all.
4. illumination displaydoes not work correctly when the ambient light changes. The light displayacquis (Display Brightness) remains unchanged even if the ambient light changes. However, pay attention to the settings. On many MacBook models, this function can be activated or deactivated in the settings. System Preferences → Displays → Automatically adjust brightness.
5. The Mac does not respond to pressing the "Power" button. It does not start or stops closing.
6. MacBook does not respond properly when you open or close the cover (flap / lid). Normally, when closing the lid, the MacBook should go into "Sleep". If this does not happen and the system remains on, resetting the SMC may be the solution.
Pe MacBook Pro 2017 model Touch BarSystem automatically starts opening the lid even if the system was initially closed completely. Shut Down. You can activate or deactivate the automatic opening of the system when opening the cover, following this tutorial on iHowTo.Tips.
7. The poppy suddenly enter the mode "sleep” or stops si you can not start it anymore.
8. MacBook or MacBook Pro it no longer loads through the harbor USB-C. New MacBook models and MacBook Pro are provided only with ports USB-C, and among others they offer support for power / charging.
9. The battery is not charging correctly.
10. MacBook or MacBook Pro does not recognize external devices connected by USB-C. External Hard Drive, mouse. keyboard, adapters USB-C and others.
11. LED on the charging adapter (MagSafe) does not indicate a correct activity of the load level. If the MacBook has a 100% charged battery, it should be green. Otherwise it is bright orange / red.
12. The Mac works unusually slow even if the processor is not required. CPU. Check in Activity Monitor if there are processes that can cause the system to run slowly before resetting the SMC.
13. The Mac don't pass on displayof his when a display external to which it was connected becomes unavailable.
16. Illumination around the incoming ports / output for Mac Pro (Late 2013) is no longer done properly.
There may be other issues that can be resolved by resetting the SMC (System Management Controller), but the above are indicated by Apple as good reasons to do so.
Reset SMC (System Management Controller) will be used as a last resort to solve a problem.
Steps to follow before resetting SMC (System Management Controller)
Try each of these steps in order, before resetting SMC. After each step, check if the problem persists.
1. If Mac / MacBook is open though he remains stuck and stops responding to any orders, hold down the Power button for a few seconds until it stops completely. Shut Down. Unfortunately, the files you work on in various editing and creation applications will be lost.
Press the " button againPower” to reboot the system.
2. press Command-Option-Escape to forcefully force an application that stops responding and can not be closed by normal command. Command – Q.
3. Place Mac in the mode "Sleep" from Apple (top left corner) → Sleep, then remove Mac from mode "sleep” by pressing any key.
4. Restart your Mac in: Apple → Restart. Check if the problem persists after restarting.
5. Shut down your Mac from Apple → Shut Down, wait a few seconds then restart the system.
If you use a MacBook laptop and have battery problems, Follow these steps:
1. Unplug the power cord from the Mac si the power adapter. Wait for a few seconds, then plug in again.
2. Close Mac (Apple → Shut Down)
3. After the Mac has completely shut down, remove the battery (if it is removable), wait a few seconds and then put the battery back.
4. Press the button "Power” to reboot the system.
If after these steps the problem is not solved, then you will have to reset the SMC (System Management Controller).
How to reset the SMC (System Management Controller) on a MacBook laptop
Before you follow the tutorial steps, check whether your laptop has a removable battery or not. Older models from 2008 to 2009 have detachable batteries, and newer models, including MacBook Pro (Early 2009) and newer, all models MacBook Air, MacBook (Late 2009) and MacBook (Retina, 12-inch, Early 2015 and newer) are provided with built-in non-removable batteries.
SMC reset on MacBook with non-removable battery
1. Close the MacBook (Apple → Shut Down)
2. Hold down the keys Shift-Control-Option from the left side of the keyboard and the Power button. Hold down the keys and the "power" button for 10 seconds. (If you have one MacBook Pro with fingerprint sensor Touch ID, it also plays the role of a button "Power". click on it)
3. After 10 seconds, release both the keys and the button.
4. Press the Power button and turn on the MacBook.
SMC reset on MacBook with removable battery
1. Close the MacBook (Apple → Shut Down)
2. Remove the MacBook battery - if you need assistance to do this, contact an authorized service Apple.
3. Hold down the Power button for 5 seconds.
4. Reinstall / connect the battery
5. Press the "Power" button to start the system.
Reset SMC (System Management Controller) on computers Mac (Desktop)
This tutorial is for iMac, Mac mini, Mac Pro or Xserve.
1. Turn off your Mac.
2. After it has stopped, disconnect the power cable and wait 15 seconds.
3. Insert the power cable back and wait 5 seconds.
4. Restart Mac from the button.
Reset SMC for iMac Pro
1. Stop iMac Pro.
2. After the system has stopped, press and hold the "Power" for 8 seconds.
3. After 8 seconds, release the button and wait a few seconds.
4. Press the " button againPower” to start iMac Pro.
After the reset SMC (System Management Controller), all functions should work in normal parameters. If this does not happen, contact a authorized Apple service in your area
*Reset SMC (System Management Controller) it is not the same as reset NVRAM or PRAM.
Hello, I have
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Imac 2015, 27, I gave it to update and it told me that it did not update pinat the end, it restarted and remained with the logo mac on the screen and the loading bar pinin the middle, what to do?