Mine have the same problem. Im doing only 1 solution everytime the problem occurs.
1. Remove the battery for 5-10secs then put it back in.
2.Unplug the usb cord on the charger.
3. Then insert again the cord into the charger
4. Put the charger on the wall socket
5. Connect the charger in your camera
Then suddenly the charging indication light will appear :)
You just have to be patient everytime it fails, just keep on doing it several times.
I guarantee it will work and it will saves your money ;) DO NOT STOP UNTIL THE CHARGING LIGHT APPEARS. Goodluck!
Remember: PATIENCE IS A VIRTUE :)