![]() ![]() Before the gray screen appears, press the Cmd, Option, P, and R keys at. After waiting five seconds, power on the computer. How to Reset the PRAM or NVRAM on a Mac Shut down your Mac. 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. On the MacBook/Pros keyboard, hold down the Shift+Control+Option keys and the Power button. 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 power light on your charger might change colors while you reset the SMC. 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. You need to press them for at least 20 seconds or so. The SMC controls the power button response, battery management, sleep settings, thermal management, lighting settings and video source selection. Press and hold the Command + Option + P + R keys at the same time as your Mac would restart. ![]() 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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