Aporte original por: danny ,
Sounds like your camera might have gotten shorted and is defective. Unscrew the two bottom screws and remove the back cover. Then remove the shield and you will have access to the [http://iphone4parts.com/shop/iphone-rear-camera-with-led-flash-module-p-85.html|iphone's rear camera]. Its not that hard to replace and is available for a good price.