I've got a Photogenic PowerLight 750 studio flash that beeps and and the\n"misfire" indicator comes on when it's triggered. (Obviously) there's no\nflash either. Anyone have any idea what could be the problem? Any advice\nother than bring it in for repair? The halogen modelling light bulb also\nneeds to be replaced but that's easy. Any schematics for this flash\nsomewhere online?