Hey guys, I recently opened up my iPhone 3GS 32GB to change my battery, and them reassembled it. When I turned it on, everything was normal, but I noticed that the auto-brightness was not working. And when I tried to make a call, I couldn't hear any ringing, and the screen won't turn off by itself. After that, I started to panic and opened the Camera app, and no surprise: it wasn't working either; it stays at the startup screen. I tried it again with the old battery, and it didn't work either. I am sure that I screwed every screw and plugged in every ribbon! So, is there a way that I can fix this problem, or am I screwed?! Thank you in advance. Edit: I tightened the 3rd ribbon and now the earpiece is working (but not as clear), but the proximity and light sensor, and the camera still aren't working. I am confused!