The System Management Controller (SMC) is a chip on the logic board that controls all power functions for your computer. If your computer is experiencing any power issue, resetting the SMC may resolve it. The SMC controls several functions, including: Telling the computer when to turn on, turn off, sleep, wake, idle, and so forth. Handling system resets from various commands. Controlling the fans.

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Intel-based iMac, Intel-based Mac mini: How to reset the System Management Controller

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