After waiting five seconds, power on the computer. Release the power button, replace the battery and reconnect the power adapter, and power on the computer.ĭesktop Macs require you to shut down the computer, unplug the power cord and wait 15 seconds before attaching the power cord again. If you're using a MacBook with a removable battery, disconnect the power adapter, shut down the computer, remove the battery, and press and hold the power button for five seconds. The NVRAM has likely been reset, as evidenced by this. Hold the keys down until you get a second startup sound or a second appearance and disappearance of the Apple logo and progress bar. To start your MacBook, depress these keys and hit the power button. Press the power button for 5 seconds and release. Hold down the Command, option, P, and R buttons simultaneously. ![]() Step 2: Disconnect the MagSafe plug from the machine. The power light on your charger might change colors while you reset the SMC. If you have a MacBook, MacBook Pro, etc that you can remove the battery from here is what you do: Step 1: Shut down the computer (again, full-on off here). ![]() PRAM or NVRAM is the smaller memory preserving the boot-up details of your macOS. MacBook models with batteries you shouldn't remove on your own require you to connect the power adapter, shut down the computer and hold the left side "Shift-Control-Option" keys simultaneously. Hence, you must force the Mac to turn off instead Now, you should press 'Control + Cmd + Power' and hold these keys for a few seconds, leading to a shutdown of your Mac. The SMC controls the power button response, battery management, sleep settings, thermal management, lighting settings and video source selection. Resetting the SMC restores the default settings related to low-level functions that you generally can't modify in System Preferences.
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