Phone turns on, but doesnt boot up to the lock screen

I recently replaced my Iphone screen. when I tried to turn it on, it wouldnt work until i plugged it into the lightning port, where it then showed the apple logo perfectly fine but after 1-2 seconds later, it would go to a black screen. The thing was still on, as the backlight was still on, but there was no display, even though the display worked fine from the apple logo. Anyone know whats going on?

EDIT: Battery cant charge, ive left it for 2 hours and wont charge. Ive already tried a hard reset.