Black Lock Mechanism for #3 connector on 3G?

Hi

my old iPhone 3g's home button was giving me some problems. So i opened it. I didnt know that reconnecting wire 3 is pain in the *^!. So after i try to reconnect it, first of all, it wont go in properly. Sometimes the golden part goes in completely but the Ear Speaker and proximity sensors still doesnt works. I read some posts related to this. They say that make sure the black latch or lock is flipped up before reinserting and down after inserting. But i cant see any lock like that. The wire has some scratches on it but that doesnt seems to be the problem. I mistakenly bent the wire several times while i was trying to insert. I'm not sure what the problem is. Please show me a picture of the lock or try to help me. Its Urgent.