CARD LOCKED appears oo screen, camera wont work?

Take out your memory card. There should be a tiny little swich with the word 'lock' next to it on the side of the memory card. Slide the switch into the 'unlocked' position and reinsert the card.
If your camera still says 'card locked', try formatting your memory card (should be available as one of the options in your camera menu). Do note that this last step erases all your pictures.
Hope this helped,
tS

Does this camera take a memory card, separate from the built-in memory of the camera? If so, remove that memory card and look closely at all sides and edges, to make sure that there is not a read-only protection switch on it.
Many of these memory cards have tiny switches, sliders back and forth, that protect the memory from being erased.
If you slid that switch into the locked position without being aware that it is there, and without knowing that you did, then the error message makes sense.
Remove the memory card and look at it very carefully.
-a.