내용은 애플 홈페이지에서 인용하였다. SMC 리셋은 노트북의 전원과 관련된 이상 증상이 생길경우 취해 볼 수 있는 방법이다. 충전이 안된다던지, 잠자기에서 깨어나질 못한다던지, 키보드 백라이트에 문제가 있는 다던지의 소프트웨어의 문제로 야기되는 이상증세의 경우 취해볼 수 있다.

intel 기반이 아닌 power pc 기반의 아이맥이나 파워북은 본문에 있는 PMU 리셋을 진행해야 한다. 링크가 있으니 따라가면 된다.

SMC 리셋 방식은 간단하다

1. 컴퓨터 전원을 끄고, 베터리와 어댑터를 모두 제거

2. 파워버튼을 5초이상 눌렀다 뗀다.

3. 베터리와 어댑터를 연결하고 다시 전원을 켠다.

Resetting an Apple portable's System Management Controller (SMC)

Learn more about the MacBook, MacBook Pro and MacBook Air's System Manager and how to reset it.

This article refers to Apple's Intel-based portables manufactured February 2006 or later. For PowerPC-based products manufactured before that date, see "Resetting PowerBook and iBook Power Management Unit (PMU)".

The System Management Controller is an integrated circuit (computer chip) that is on the logic board of the computer. As the name implies, it is responsible for power management of the computer. It controls backlighting, hard disk spin down, sleep and wake, some charging aspects, trackpad control, and some input/output as it relates to the computer sleeping.

Over time, the settings in the System Management Controller may become unusable, which can result in operational anomalies with the computer. Examples include not turning on, not waking from sleep, not charging the battery, or not recognizing the AC Adapter, among others.

Resetting the SMC is not intended for resolution of a stall or situation in which the computer is unresponsive. An SMC reset should not be necessary except as a last resort in cases where a hardware failure of the power management system is suspected. Performing an SMC reset returns the hardware, including NVRAM (Non-Volatile Random Access Memory), to default settings and forces the computer to shut down.

For most situations, a restart is sufficient. If the computer has stopped responding, try each one of these steps, one by one. Test in between steps to see if it has worked. If one step works, don't worry about the next, as you're up and running! Only go on to reset the SMC if you've tried all of the steps listed here and the computer still isn't working.

1. Force Quit (Option-Command-Escape)
2. Restart (Control-Command-Power)
3. Force Shut Down (press the power button for 10 seconds)

Only perform an SMC reset on the computer if none of the above steps resolved the situation. If this is the case, see below for instructions on locating the reset button or key combination for your model of computer. If your computer is earlier than the models listed here, see "Resetting PowerBook and iBook Power Management Unit (PMU)" or "PowerBook: Resetting Power Management Unit (PMU)".

MacBook, MacBook Pro

1. If the computer is on, turn it off.
2. Disconnect the AC Adapter and remove the computer's battery.
3. Press and hold down the power button for 5 seconds and then release the button.
4. Reconnect the battery and AC Adapter.
5. Press the Power button to restart the computer.

MacBook Air

1. If the MacBook Air is on, turn it off.
2. Connect the power adaptor to a working power source.
3. On the MacBook Air keyboard, press (left) Shift-Control-Option along with the power button once.
   Note: You must use the keys on the left side of the MacBook Air keyboard.
4. Wait 5 seconds and press the power button to start the MacBook Air.

Apple recommends only performing an SMC reset when the MacBook Air has been properly shutdown. This prevents issues from occurring to the file system.

While the power adaptor does not need to be connected to reset the SMC, it may be necessary in situations where the battery needs charging, or the MacBook Air has been without power for an extended period of time.

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