Iphone 7 won't turn on?

It displays the apple logo for a few seconds before returning to a black screen, then repeats for a little while and then stays black. Any help is appreciated!

I'm getting the iPhone X tomorrow. Last few hours with my 7 Plus

Buy a new one

This has happened to me before, and I simply took the battery out and put it back in. Make sure your phone is fully charged as well.