Why is my camera not working, either the shutter stays closed, or the screen stays black and none of the option buttons work

My camera is currently not working, the shutter will not open correctly. If it does open the screen stays black and the buttons on the screen are not accessible. I have tried hard boots, restarting removing all apps that utilize the camera. Checked the settings for restrictions. I would greatly appreciate some support in correcting what seems to be a epic fail on my week old iPhone 5.