Soo annoying how it was working then bang it doesn't turn on again

Hey guys am ran into abit of a trouble with my Amazon tablet it's a 5th gen tablet.. I downgraded the firmware I had to root it... Then when I sideload the firnwareb everything went great till I rebooted the tablet now it doesn't turn on at all I've tryed holding the power button for a while still nothing any ideas... Many thanks

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