How to Reset SMC and Pram/NVRAM on Mac
http://versionsoffice.com/how-to-reset-smc-and-pram-nvram-on-mac/
Unfortunately, a few of the time, the MAC device does not work the way it should work. Starting from light might not work properly to it stop booting and so on. Sometimes, these kinds of problems can be fixed by closing the application.

 

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