Screen not turning on suddenly after it popped out. Potential Causes?

Hey there,

I putting a new tempered glass cover on my phone, when the screen popped out. The screen was still working, however. No problem, I will need to just glue it on after. Then, after putting on a new tempered glass the screen wasn't turning on any more! Does anyone know what could cause this? The phone still seems to be working, when I hold the power buttons it vibrates a bit, but the screen is completely black.

I removed the back panel, and it seems like the rear connection is fine. Does anyone have any ideas about what could be broken? I would rather not get a new screen, as I may as well get a new phone. I am honestly more annoyed than anything that I seem to have broken my phone, and I would like to know what it could have been. Did I accidentally pull too hard on anything? Thank you!