I replaced my screen and is now unresponsive.

1. My screen cracked.

2. I replaced it.

3. It worked fine for 2 weeks.

4. Then...Phone screen became unresponsive. (turns on, thumb print sensor doesn't work)

5. I did a hard restart and soft restart and still unresponsive.

6. took it to apple store and they wouldn't help me cause I replaced the screen.

7. I took it to a third party service person and they tried three different screens and none worked.

What happened? What is wrong? :(