... and now I can't get the LCD to turn on. When I plug it into my mac, it shows up and I can sync it and everything. I notice that the motherboard connection is somewhat loose though. I did a restore and I can't seem to fix it.
Check the LCD connector cable inside the phone. They have a tendancy to pop out. If they aren't bent correctly the ribbon cable can be pulled up by the digitizer cable when closing the unit. There should be a slight kind in the cable itself between the 2 white lines.
It's annoying that the LCD cable itself is actually very rigid and unless bend correctly will pop out of its own accord.
Thankfully the iPhone is easy enough to open without risking damage imo (suction cup and pull)