Immediately press and hold down the Option (Alt) + Command + R + P keys together for 20 seconds (or until the screen goes all black and comes back to gray again, or you hear the startup sound (in some old models))ĥ. Press the Power button to boot your MacBook ProĢ. Press and hold down the Power button for 5 secondsħ. Press the Power (Eject) key to boot your MacBook Proģ. Press and hold down the SHIFT + Ctrl + Option (Alt) + Power (Eject) keys together for 10 secondsĤ. Unplug your MacBook Pro from the power supplyĢ. On a MacBook Pro without Removable Batteryġ. Here’s how you can reset SMC and NVRAM (PRAM) on your MacBook Pro: If any of these information gets corrupt, your MacBook Pro may fail to start properly or won’t start at all. NVRAM or PRAM (in older Mac computers) stores the information about system settings such as the startup disk to boot your Mac from, system date and time, screen resolution, etc.
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