How to Reset the SMC on Intel and M1 Macs
Before you begin, try closing all your open apps and restarting your computer. Wait five seconds, then press the power button to turn on the computer. Plug in the MagSafe power adapter to a power source, connecting it to the Mac if its not already connected. An SMC or System Management Controller Reset can fix various power related issues, such as a piece of hardware not functioning correctly. Press and hold the power button for five seconds, then re-connect both the battery and the power. If, however, you can see a crack outlining a rectangular section, and there’s some mechanism for opening something nearby, you’ve got a removable battery. The LED on the MagSafe power adapter might change colors or temporarily turn off when you reset the SMC. …