System management control (SMC) 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. If you are having not turning on, not waking from sleep, not charging the battery, or not recognizing the AC Adapter issues, it may worthwhile to reset SMC. I brought my Mac Book Pro to Apple store because of display wake up issue. Only thing they had done is SMC reset. If you are using Mac Book, Mac Book Pro follow the following steps to reset below:
- If the computer is on, turn it off.
- Disconnect the AC Adapter and remove the computer’s battery.
- Press and hold down the power button for 5 seconds and then release the button.
- Reconnect the battery and AC Adapter.
- Press the Power button to restart the computer.
For more details, check here.
