We moved to a new home in January. In the dining room is a ceiling light fitting with 4 small halogen bulbs (Phillips G9) controlled by a dimmer switch. Up until last week it all worked perfectly. Then one evening there was a flash and the lights went out and tripped out the downstairs lighting circuit. I found that one bulb had blackened and was obviously gone. When I replaced the bulb the fitting still didn't work. I can't detect any other damage to the fitting. Could it be a problem with the dimmer switch? Can anyone advis eme please?