If your Mac starts to behave unexpectedly (applications quitting randomly, display dimming for no reason, slow shutdowns, or sometimes your Mac does not start up) a good practice is to reset your Mac parameter nonvolatile random access memory (NVRAM). NVRAM is a small subset of RAM on your Mac used to store certain system settings. Read more about NVRAM on Apple’s Support site.
Note: NVRAM and PRAM are reset the same way below if you are running Mac OS X on your Mac. Both are the same types of ram on Mac’s today.
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