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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
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* 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
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Every MacBook Pro made after late 2009.
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If, however, you can see a crack outlining a rectangular section, and there’s some mechanism for opening something nearby, you’ve got a removable battery.Īccording to Apple, the following models do not offer a removable battery. If you see a single piece of metal, with no slider for removing the battery, your battery is not considered removable for the sake of this tutorial. It’s easy to determine whether your MacBook has a removable battery: just look at the bottom. Resetting the SMC works slightly differently on older MacBooks, which offered removable batteries. If your Mac runs slowly even when Activity Monitor doesn’t show a lot of CPU usage, and you’ve tried a number of other steps, resetting the SMC might help. But problems with the SMC can also occasionally affect system performance. If any of these functions are behaving oddly, resetting the SMC could solve it. Selecting an external (instead of internal) video source for some iMac displays.Status indicator light (SIL) management.Responding to the display lid opening and closing on Mac notebooks.Responding to presses of the power button.

Here’s a complete list of what the SMC does, straight from the Apple website : For example: when you plug in the power supply for your Mac laptop, the lights on the charger work even if your Mac is completely shut down. Some functionality of your Mac works regardless of whether it’s turned on. Mac desktops, meanwhile, basically just need to be unplugged. Any Mac laptop made since 2009 doesn’t have a removable battery, meaning you’ll need a keyboard shortcut to get the job done. The exact method for doing this varies depending on your Mac.
