I have halogen ceiling lights in my bedroom. They have worked fine for 10+ years. All of a sudden the circuit breaker has started tripping as soon as I turn them on. I have changed nothing other than plugging a larger plasma TV into a receptacle on the same circuit. However, I have tried unplugging the new TV and turning everything else on the circuit off and the breaker still trips instantly when I turn the light switch on. There is only one switch for the bedroom lights. I have tried removing all four of the bulbs in the ceiling fixtures but the breaker still trips the instant I switch the lights on. I also removed the switch and everything appeared to be in order (i.e. no wires touching, etc.). Any thoughts as to what might have happened to suddenly cause this problem?