How to reset SMC on All macbook

How to reset SMC on macbook - So you've tried rebooting, you've reset the PRAM, you've done it all, but your Mac still acting strangely. What is next? In certain circumstances, on your Mac System Management Controller (SMC) may be a solution. It is sometimes necessary to restore the function of the system is lower normal level of your Mac. So you have to reset the SMC on your macbook, please read the following article

How to Reset the SMC on a Mac portable with battery off, How to Reset the SMC in a portable with no removable battery position, How to Reset the SMC for Mac Pro, Intel-based iMac, Intel-based Mac mini, or Intel-based Xserve
SMC reset

System Management Controller (SMC) is responsible for many low-level functions on Intel-based Macs. These functions include :

  • Responding Response presses the power button
  • Responding to the response of the display lid opening and closing on portable Macs
  • System Batree
  • Cooling System
  • SMS (Sudden Motion Sensor)
  • Ambient light sensing
  • Keyboard backlighting
  • System Status Indicator Light (SIL)
  • Battery status indicator lights
  • Selecting an external (instead of internal) Target Disk Mode video source for some iMac displays


It is possible that the SMC could face problems that can cause unusual system behavior typically related to the symptoms described below. In some cases, resetting the SMC may be the only correct method to resolve the issue, however, SMC reset should only be attempted after all other standard issues have been conducted.

These symptoms may indicate that the SMC reset may be necessary :

1. Fans (Fan)
Fan / fan rotates rapidly and with high speed.
Fan / computer fan running at high speed even though the computer is not experiencing heavy use and well ventilated.

2. Light
Keyboard backlight appears to behave correctly (on Mac computers that have this feature).
Status Indicator Light (SIL) appears to behave incorrectly (on Mac computers that have a SIL).
Battery indicator lights, if any, appear to behave incorrectly (on a portable that uses a non-removable battery).
The backlight of the screen does not respond properly to environmental light changes on Mac computers that have this feature.

3. System
Computer does not respond when the power button is pressed.
Computers do not respond properly when you close or open the lid.
Computer sudden sleep or shut down by itself.
Battery not charging process correctly.
The MagSafe power adapter LED does not appear to indicate charging activity right.

4 System Performance
This computer is running extremely slow despite not experiencing abnormally high CPU utilization.

5. Video
A computer that supports target the display mode is not switched into or out of target display mode as expected. A computer that supports the display mode to target into or out of target display mode at unexpected times.

Before Resetting the SMC Firmware


Try each of the following steps in this order before you reset the SMC on mac. Test the issue after completing each problem step to determine whether the problem still occurs.

  • Press Command + Option + Escape (Force Quit) to exit the coerce any application that is not responding.
  • Put your Mac on the position of sleep by choosing the Apple menu top left of the menu bar and then select Sleep. then wake it back on when the position of sleep.
  • Restart your Mac by by choosing the Apple menu top left of the menu bar and then select Restart.
  • Shut down your Mac by by choosing the Apple menu top left of the menu bar and then select Shut Down.


If your Mac appears to be running normally but is not responding, force the computer to shut down by pressing and holding the power button for 10 seconds.
Note: You will lose unsaved work in open applications.

Mac portable experiencing problems related to the MagSafe power adapter and / or battery, try :

Unplug the MagSafe power adapter from the Mac and the wall power socket for several seconds.
Mac Shutdown. Physically remove and replace the battery (if it's removable) and startup the Mac.
If the problem is still not resolved after following the troubleshooting items above, resetting the SMC may be required.

How to Reset the System Management Controller (SMC)


How to Reset the SMC on a Mac portable with battery off

  1. Note: Learn about removing the battery on MacBook and MacBook Pro.
  2. Turn off the Macbook / Shut down.
  3. Disconnect the MagSafe power adapter from the computer, if connected.
  4. Remove the battery.
  5. Press and hold the power button for 5 seconds.
  6. Release the power button.
  7. Connect / replace the battery and MagSafe power adapter.
  8. Press the power button to turn on the computer.


How to Reset the SMC in a portable with no removable battery position

  1. Note: Portable computers that have a battery you should not remove batree eg in MacBook Pro (Early 2009) and later, all models of MacBook Air, and MacBook (Late 2009).
  2. Turn off the Macbook / Shut down.
  3. Connect / Plug in the MagSafe power adapter to a power source, if not already connected.
  4. On the keyboard, press (left) Shift-Control-Option keys and the power button at the same time.
  5. Remove all keys (Shift-Control-Option) and the power button at the same time.
  6. Press the power button to turn on the computer.


How to Reset the SMC for Mac Pro, Intel-based iMac, Intel-based Mac mini, or Intel-based Xserve

  1. Turn Off Computer / Shut Down
  2. Disconnect Power
  3. Press and hold the power button for 5 seconds
  4. off power switch
  5. Replace / power cable conect
  6. Turn on the computer dean pressing the power button
This article quoted from several sources, if there is any question please contact us at the contact page. If you want to download SMC firmware for your Macbook please go to the search field to find software, we have provided some articles for smc download firmware directly from Apple's website, for examples you can go to MacBook Air SMC Firmware Update Download to download the smc firmware for macbook air. thanks

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