Replaced screen & worked but then stopped working

I dropped my phone and despite it not cracking it went totally black (screen). When attempting to turn device on, I could feel a vibration in the power button. Replaced screen using ifixit. When originally attached new screen phone worked. But then I disconnected it to apply the adhesive & when I reapplied the screw/screen it wouldn't work. What in the world??? Does anyone have any advice?