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Intel-based Macs: Resetting the System Management Controller (SMC)
http://support.apple.com/kb/HT3964
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Resetting the SMC for Mac Pro, Intel-based iMac, Intel-based Mac mini, or Intel-based Xserve Shut down the computer. Unplug the computer's power cord. Wait fifteen seconds. Attach the computer's power cord. Wait five seconds, then press the power button to turn on the computer.