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Question: Built in Flash issue

I have a FujiFilm HS10. I am having a problem with correct exposures requiring the built in flash. The exposures are inconsistent and downright embarrassing when I "show off" the supposedly great pictures. Out door stuff is no problem as long as I don't need the flash. I have tried all modes and none of the modes seem to work with the flash satisfactorily. Any help out there ?