Why is my Mac shut down after I plugged in my IPad for syncing?

My Mac Book Pro 13’ mid. 2012 is dead after I plugged in my IPad for syncing.

My Mac isn’t obviously damaged, maybe overloading or something like that. But I really don’t what happend.

I would be very thankful for some helping suggestions.

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Can you give us a bit more here... did the system stop working as soon as you plugged in the USB connection? Is the Lightning cable worn?

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