Why is my iPhone 6 plus not turning on?

My phone accidentally dropped, then after that it became 2%. I then tried to charge it whole day but it isn’t changing so I unplugged it. It got drained then and it turned off, when i tried to charge it again it only shows the apple logo then after the logo it becomes black screen but it’s like it’s on. I tried to connect it to my laptop so I can see it in itunes but it’s undetected in itunes and in my laptop it doesn’t show anything and the logo doesn’t show either. PLS I NEED HELP!