A picture was taken, screen was closed, camera

Go to your menus,if you can get the camera on and find the reset all.
This will set all menus to factory default, then set what your preferences are.

Take your batteries out, and make sure they are in correctly.
Make sure your batteries are fresh or they are charged to full. You should read your user manual, or download one here in pdf format.
http://gdlp01.c-wss.com/gds/0900001226/PSA640_630CUGad-EN.pdf