Wont charge or start after reseating screen

Battery was changed on this phone earlier which was a swollen and was working fine. The screen was not properly seated so I took it upon myself to re-seat the screen. After I did this (I removed battery connector first thing) and put it back together it wont turn or show any sign of life. Home + Power button does nothing. Holding power button and 3 seconds later home does take it to restore mode. I was able to restore but once restore is done, back to square one - no life. At this point this phone is not even my secondary phone so not planning to spend any more money. I am only curious as to what must have gone wrong.