Why does it say that there is no external storage for my camera? It won't let me use the camera.

There is a slot on the camera, usually for a microSD card. Make sure that a card is inserted in the slot, that the card has been pushed down until it clicks into place and locks, and that the card size inserted is supported by your camera. Then check your camera setup menu and make sure that you don't have to format the card for your camera. These operations are covered in the manual.

There might b sd card mounting problem.. try using ur sd card in any other device and see if it works.. if it does not, there is little u can do. apps are avaiable on android market to resolve sd card problems and revover data. however, if it works fine in other device and only shows problem wid the cam, it might b that the device does not support the sd card, ie. the storage capacity is too large to be mounted by the device-.