Screen display keep cycling through apple logo and blank screen and won't turn on
I dropped my iPhone 6 on the floor, which turned it off and it wouldn't turn back on. When I put it on charge the apple logo came up so I thought it was going to turn on, but instead it went to a blank screen, and then the apple logo came up again and so on. When I take it off charge the screen is blank and the phone won't turn on, what is wrong with it?
iPhone 6, iOS 11.2.6