Resetting PRAM and SMC is a way out if your Mac starts behaving strange.Note: Before resetting PRAM or the SMC, back up your important documents or your whole system on an external drive. Sometimes your Mac might act strangely for no apparent reason: lights won't work correctly, volume settings are messed up, the display resolution will change, or maybe your Mac won't boot at all A reset of the SMC and PRAM/NVRAM can help any Mac, including MacBook Pro and MacBook Air, run smoothly again. After resetting PRAM/NVRAM, you may need to adjust some of your Mac's settings, such as time, date, sound volume, or time zone Hold the keys until your Mac restarts and you hear the startup sound. Immediately press the Command+Option+P+R keys. So do the following to reset PRAM on Mac: Turn off your Mac.Step 2: Press and hold the Left Shift + Control + Option + Power keys/button for 10 seconds How to reset the Mac's NVRAM, PRAM, and SMC Macworl Press the power button, and as soon as you power up the laptop, hold down Command-Option-P-R All MacBook models except for the 13-inch model from mid-2009 Step 1: Shut down the MacBook. To reset your NVRAM, you use exactly the same procedure you once used to reset PRAM.
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