MacBook Repair: How to Reset PRAM and SMC on Your Mac
Resetting the PRAM and the SMC is a quick and simple way to get your Mac back to normal if you’ve tried the standard troubleshooting techniques, like restarting or closing down the apps you’re using, but they don’t appear to address your problems. if you want to exhausted all problems and want to know about them so visit here.
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MacBook Repair: How to Reset PRAM and SMC on Your Mac
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MacBook Repair: How to Reset PRAM and SMC on Your Mac

However, if you have exhausted all options, then you must take your MacBook to a MacBook repair service center to get the problem resolved.