I just recently replaced the front assembly of my iPhone 4 32gb. The front camera wasn't working before so i assumed it was broken when I broke my screen. The screen works perfectly fine with no problems but the camera still doesn't work. I also replaced the camera with a new one that I ordered online. I also bought a camera from a repair shop. So i have 3 cameras but none work in my iPhone. The shutter won't open when I open the camera app. Only the front camera works.. The back camera is stuck. Hardware or software issue? Please help.