How to Reset SMC


The SMC on Intel Macs runs several of the small functions of the computer, including power functions, responding to the closing and opening of a laptop's lid, thermal management, and a variety of other system functions. Resetting the SMC should be performed after all of the computer's applications have been quit, the computer has been put to sleep for five minutes, then woken up. Indications that the SMC may need to be reset after this process include fans running at high speed, lights not working correctly, the computer not responding to presses of the power button and abnormally high CPU usage when utilizing small applications.

Things You'll Need

  • Mac computer

Resetting the SMC

  • Shut down the computer and unplug the computer's Magsafe adapter (or power cord, if it's a desktop unit).

  • Take the battery out if the unit is a laptop computer with a removable battery.

  • Press down the power button and hold it for 5 seconds, then release. Replace the battery if necessary and plug the computer back in. Turn on the computer and test functionality.

  • Take different steps for those laptops with a battery that should not be removed. This includes the MacBook Air and MacBook Pro units from 2009.

Nonremovable Battery

  • Shut down the computer and plug it into a power source.

  • Press down the left-side Shift button, the Control button, the Option button, and the power button at the same time. The computer should not turn on at this time.

  • Release the buttons, then turn on the computer. Test the computer's functionality.

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