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Hello! Welcome to JustAnswer. My name is***** am happy to be assisting you today.I am sorry to hear you are having trouble with your MAC. Hopefully, we can get this resolved quickly.
You can try upgrading it from the MAC App Store:
You can also refer to the below link.
If you’re not successful, you can schedule an appointment with the Apple store using the below link to get it diagnosed for hardware issues.https://www.apple.com/retail/geniusbar/