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* Video and external displays not working: display brightness functionality not working properly, target video mode isn’t working properly, external display isn’t working, etc * Light problems and improper lighting management: battery indicator lights aren’t working, display backlighting isn’t adjusting to ambient light changes, keyboard backlights not working, 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

* Issues with your Mac cooling fans and fan management: the fans run constantly at high speed, fans run high despite low CPU usage and adequate ventilation, fans not working at all, etc Resetting a Mac SMC is particularly effective if you’re having the following types of problems: Typically, an SMC reset helps to resolve many power and hardware related issues that are otherwise unresponsive to troubleshooting techniques. When & Why Reset SMC on a Mac? Some Common Hardware Reasons We’ll show you exactly how to reset the SMC on any type of Mac (and any version of Mac OS X) and the type of problems that it may resolve.