Introduction
The following symptoms may mean an SMC reset is needed: * Your computer's fans are running at high speed, even if the computer is not under heavy load and is properly ventilated. * Keyboard backlight works incorrectly. * Status light, if present, is malfunctioning. *Battery LEDs, if present, work incorrectly (for Mac laptops with a non-removable battery). * The display backlight does not react correctly to changes in brightness. * Your Mac does not respond when you press the power button. * Your Mac laptop does not respond properly when you close or open the lid. * Your Mac goes to sleep or shuts down unexpectedly. * The battery does not charge properly. * MagSafe Power Adapter LED does not indicate correct activity. * Your Mac is abnormally slow, although its processor is not heavily used. * A computer that supports the target display mode does not switch between modes as expected, or switches between modes unexpectedly. * Mac Pro (Late 2013) I/O ports are not illuminated when moving the computer.
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If your Mac isn't responding, force shut it down by pressing and holding the power button for 10 seconds. Any unsaved data in open applications will however be lost.
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Press Command+Option+Esc to force quit any unresponsive app.
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Put your Mac in sleep mode by choosing Sleep from the Apple menu. Wake the computer after it went to sleep mode.
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Restart your Mac by choosing Restart from the Apple menu.
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Shut down your Mac by choosing Shut Down from the Apple menu, then turn it back on.
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Unplug the Mac's power adapter and power outlet for a few seconds, then plug them back in.
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Shut down your Mac.
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Remove and reinsert the battery (if removable).
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Restart your Mac.
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