yes I tried all of that. I was thinking that my camera may have went bad but both the rear and front camera aren't working. When I take a pic it just takes a black pic. About a week ago I replaced my screen and case but it worked fine right after I did that. Do you think that may have caused it?

Hey guys, I'm having issues with my Iphone 4 running ios 7.1.2. the other day i noticed my camera wasn't working, i mean the app is launching but the camera isn't showing anything on my screen... Any suggestions??