So I've got an SMS2 which seems to be working ok. I've had it a few years and it came with a light gun. I eventually got around to buying a light gun game which arrived today. However although the screen flashes when I fire the trigger, there's no indication that it's 'hitting' the screen. Do they work ok with modern flat screens? I only have one tuneable TV, a little flat screen. If they *do* work ok, any idea where to start diagnosing problems?