I just changed the screen on my iPhone 5s. After I booted up I had no power. I plugged it into my PC and then opened iTunes. iTunes tells me that I needs to restore the phone, so naturally I do and when it gets to the "waiting for iPhone" it then quickly gives me the error 40 code. I don't know what to do, the screen also doesn't display anything properly, and by that I mean the apple logo, because its the only thing I get it to display(the phone turns on when this happens only when iTunes gets into the "waiting for iPhone" part).