Before you proceed to SMC reset, make sure to quit all the apps, even force quit the ones that are not responding (Command-Option-Escape). Also, make sure you have this instructions open on other device, because you’ll have to shut down your Mac.
How to reset SMC on your Mac notebook:
Shut it down. Plug the power cord in. Press Shift-Control-Option (the ones on the left of your keyboard) and power button simultaneously. Release. Now just turn on your Mac as usual.
How to reset SMC on your desktop Mac:
Shut it down and unplug it. Wait 5 seconds and then plug it back in. Wait another 5 seconds. Turn it back on.
PRAM/NVRAM reset
NVRAM (non-volatile random-access memory) P (Parameter) in older Macs. Resetting NVRAM is generally recommended when you experience issues with screen resolution, when your Mac starts with the wrong disk or when kernel process panics.
First, shut the Mac down. Now, find Command-Option-P-R keys. Turn the Mac back on and right after you hear the startup sound, press all Command+Option+P+R keys at once. Hold them until your Mac restarts and you hear the startup sound again.
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