Installed new screen following great instructions, tried to turn on, nothing happened. Tried home+power for 10+ seconds. Nothing. Connected to MacBook and it sees my my iPhone. Tried the home+power and iTunes said that there was a problem. It would try updating, otherwise a restore would be necessary.

Downloaded update, installed (always with screen off), and restarted my iPhone. Alas, it couldn't complete the update because there's a passcode on myiPhone. And.. I can't disable it obviously because I have no access to the screen.

I disassembled and reinstalled the old cracked screen and tried to start the phone again. Nada. Same thing.

I'm tech savvy and used to building my own hardware, this wasn't hard to do and I think I followed everything smoothly. Any suggestions why this isn't working?