|Strange, I thought I'd already answered a post exactly like this.|
When you drop a camera then just about anything inside could have been damaged. It is therefore impossible for anyone to suggest what it might be. In any case unless you are technically able to repair a camera taking it apart could cause more problems that you fix.
Sorry but there is nothing you can do from the outside so it either has to be repaired or replaced.
Always pop back and let us know the outcome - thanks