iPhone not turning on after battery replacement.

This turned out to be more difficult and stressful than I thought it would be. I had a swollen battery which, until I attepted to fix it, was still working, abiet a bit wonkey. I bought the battery replacment kit. When I tried to follow the instructions, I ended up confused. The suction cup appeared to put the glass away from the LCD display, which is now scratched. I scratched it while trying to use the plastic tools to get the clips apart. They were useless. When I consulted a JerryRigEverything video from 2013, I used a razor and it came apart like it should. The swollen battery took a bit of a pull to get it out. I don’t think I damaged any of the ribbon cables. The small plastic bit around the camera kept falling out. I think I got it back in there. But now, when I plug it back in. Nothing. Dead. I will try the whole thing again at some point, but I wonder if I haven’t damaged something and I’m not sure how to diagnose. It could be the charge cable. I’m not sure. Any thouhgts on the next step? I’m going to plug it into the computer. I may try ripping it out and putting it back togther again, in case it isn’t connected as well as I think it is.