The manual suggests you try the following:
1. Confirm that you are using the correct type of battery, and that there is sufficient charge.
2. Confirm that the battery is inserted facing the correct way.
3. Confirm that the memory card/battery door is fully closed.
4. Dirty battery terminals may reduce battery performance. Try cleaning the terminals with a cotton swab and reinserting the battery a few times. http/gdlp01.c-wss.com/gds/6/0300007146/01/psa4000is-a3400is-a2400is-a2300-a1300-a810-cug-c-en.pdf