回答“Constant charging / sync / startup sound but no display no boot”I have the same exact problem. I tried to put all of the innards of my dads phone into a new housing and lcd. Well, got it all in, worked GREAT! Then I realized the sim holder would not eject. Forgot to switch over the lever to release it. So I had to reopen it. I assume that I may have been to forceful on reopening and possible tweeked the screen a little. But, in the world of iPhones a little is a LOT. iTunes still reads it and said that I did a successful reboot on the phone, but still nothing shows on screen and the chirp still repeats. Your questions and your updates have been great. Spot on to my problem and I am hoping this is my solution as well! I'll update when I have another over priced screen lol!