Suddenly my Mac book pro completely shut down! UnAble to start it up.
What is happening with my computer? It suddenly shut down and won’t restart.
MacBook Pro 13″, macOS 10.13
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See this article https://support.apple.com/en-us/HT204267
Make sure it is connected to a good charger. Let it charge for about an hour. Then hold the power button like starting it up normally. If that does not work, hold the power button for about 10 seconds.. Then let go. Then try to start normally.
If still no luck, it will need service. It could be simple (charger, battery ...) or something major.