Lumia 1320 won't turn on after downgrading

I update my Lumia 1320 to windows phone 10 preview and after that I want to downgrade to windows phone 8.1 with windows device recovery that was unsuccessful. after that my phone never turn on(even not show Nokia logo) only vibrate when I connect that to PC or charger or when I press and hold power button. what's problem? any idea? sorry for my English.

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