Most cameras have a factory reset setting in the Menu.
Check your User Guide and see if you can find the location of the reset.
It will return all settings back to the way they were originally.
I am having trouble with my new Panasonic DMC-FX100 12mp. In the simple mode it is meant to auto focus but you have to manually focus. I dont know if I have done something to stop the auto focus but cannot find any help with the instruction booklet. Hope someone can help.