Description: In certain instances, you may need to reset you Mac's System Management Controller or SMC. If you are experiencing any of the problems listed below and all other troubleshooting methods have failed, resetting the SMC is the next logical step for these issues:

• Issues with your Mac's cooling fans and fan management: fans run constantly at high speed, fans run high despite low CPU usage and adequate ventilation, fans not working at all, etc.
• Power management and battery problems: Mac isn't turning on, sleep isn't working, random shutdowns and reboots, battery isn't charging, Mac won't wake from sleep etc.
• Light problems and improper lighting management: battery indicator lights aren't working, keyboard backlights not working, etc.
• Video and external displays not working: display brightness not working properly, target video mode not working properly, external display not working, etc.
• General performance and functionality problems: abnormally sluggish behavior, external ports not working, airport & blue tooth not functioning, external devices are not being found, etc.

So, now that we've determined the problem and that resetting your Mac's SMC is the next step, the next question is how? Below is a list of different Mac styles and how to reset the SMC on each.

Reset the SMC of a MacBook or MacBook Pro with a detachable battery:

• Shutdown the MacBook/Pro and remove the battery.
• Disconnect the power adapter, hold the Power Key for 10 seconds.
• Release the power key and reconnect your battery and power adapter.
• Turn your Mac on.
• Boot as usual.

Reset SMC of a MacBook or MacBook Pro with an internal battery:

• Shutdown your MacBook/Pro.
• Connect the power adapter to your Mac.
• On the MacBook/Pro's keyboard, hold down the Shift+Control+Option keys and the Power button at the same time.
• Release all keys and the power button at the same time.
• Boot your Mac as usual.

Reset SMC of an iMac, Mac Pro, or Mac Mini:

• Shut down your Mac.
• Disconnect the power cord.
• Press and hold the Mac's power button for 5 seconds.
• Release the button.
• Reattach the power cables and boot the Mac as usual.