iPhone goes blank after apple logo appears for half a second.

I installed a Glowing apple logo to my IPhone a while back. After some time my screen began to get very dim even at full brightness. And then my screen suddenly died but I could still use the phone and I could press buttons in the background and even listen to videos even if the screen was completely blank. I tried disconnecting the screen and reconnecting and nothing so I bought a new screen and a new battery and my phone booted up. It displayed the dead battery icon I charged it up and after that the phone displayed the Apple logo for about half a second and the screen went blank again. I could see under the display and it was still on it just can't display anything. Any help is greatly appreciated thanks!