I've just replaced the screen and back glass on my girlfriends iPhone 4. Everything went fine, until i started it up, and started checking the basic functioning. The wifi has packed up completely and i'm now getting the "greyed out" problem and the words "no wifi" in settings. What i can't get my head around is, nothing has been damaged, lost or not replaced. Everything has gone back in the right place. I know the wifi antenna is part of the microphone/dock connector unit, and everything is fine there. The connector is in place. Any ideas?