Sony CYBER -shot DSC-w190 does not flash when taking picture although flash auto on

It will only flash when there is not enough available light when in AUTO flash mode.
To flash no matter what, go into the camera setting and select that choice.
Normally something like demand flash or a symbol that looks like a lightning bolt. Then it will flash every time. That does use more battery power though. By the way, I like that setting better too.