Recently I ran into some problems with the camera. In an effort to narrow down the problem, I tried Instagram, mirror and camera apps. Instagram works fine until I press the button to take photo, and an error message pops up saying "Cannot connect to camera". When I start the mirror app, it's just all black. When I open the camera app, everything's black too but the tool button, sliding zoom and such are still there.

Anyone know how I should go about fixing this?