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If the battery is removable
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Shut down your Mac.
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Disconnect the MagSafe power adapter from your computer.
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Remove the battery.
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Press and hold the power button for 15 seconds.
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Reconnect the battery and MagSafe power adapter.
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Press the power button to turn on your Mac.
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The LED on the MagSafe power adapter might change colors or temporarily turn off when you reset the SMC.
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