My mac randomly cut off and it won't turn back on, what do I do?

I just bought my mac the other day and I was about to Facetime someone and it randomly cut off and it will not do anything. It wont even charge. I don't know anything about computers so I have no clue what to do. PLEEEAAASSSEEE HEELLPP!!

If it's new, then it is under warranty. Please make a Genius Appointment and take it in for service. If it is a used computer then you need to provide more information. If your battery will not take a charge, then either the charger is not working or the battery needs to be replaced or both.

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