"What is the settings? You can tell the camera not to use the flash and you can even tell it to use it even during daylight shots as a fill-in.
If you're sure it should be going off as the lighting is very dark you may have a broken flash tube. Did you drop your camera? Often that's when the tube breaks.
Best to get your camera to a camera repair shop to check it out."
I have an IS710 with the same flash problem. It does not always go off even when set to do so but other times it works fine. I can tell because the little orange light above the view finder does not light up (indicating it is charging the flash) when this problem occurs. It is due to a reported problem with the camera. I think some other models have the same issue. I internet researched it over a year ago and other owners were reporting the same issue.
