Plug the power cable back in, then turn on your Mac.Keep all four buttons pressed down for ten seconds, then let go. Hold the left Shift+Control+Option keys down, then press and hold the power button down.Unplug the power, then shut down your Mac.If you have a MacBook without a removable battery, you can reset the SMC by turning on your computer while holding a specific keyboard shortcut. Update: If you have a newer Mac with an Apple T2 Security Chip (found in many Macs released in 2018 or later), you’ll need to use a slightly different process to reset your Mac’s SMC. Resetting the SMC on a Mac Laptop Without Removable Batteries But resetting the SMC works differently depending on whether you have one, so determine that before proceeding. Like we said: it’s been a long time since Apple laptops had removable batteries. Every MacBook Pro made after late 2009.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.

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