Hi My I had troubles with the home button in my iphone 4 (I had to click 20 times to make it work). So I replaced the button and the ribbon. But since then it doesn't work at all. I thought I bought a bad part, so i bought another one, and put it in the phone. But still no response. Did I do sth wrong when I reassembled the phone ? Should I change another part ? Thanks for your help.