Resetting the System Management Controller (SMC) on a Mac may help in troubleshooting a number of issues including fan management, power and battery issues, lighting problems and video problems. An SMC reset should only be attempted after other troubleshooting techniques fail, according to Apple. Resetting the SMC on an iMac differs from resetting the SMC on other Mac computers.
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Go to the “Apple” menu and select “Shut Down.” Confirm you want to shut down the computer.
Disconnect the iMac power cord from the wall once the computer has shut down.
Press the iMac power button and hold it down for five seconds before releasing.
Reconnect the iMac power cord to the wall outlet.
Press the power button to turn the computer back on.
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