I have six recessed lights in the kitchen. I bought six new LED bulbs to replace the old incandescents. I had to lower the socket an inch or two along the track in the recessed fixture in order to get the bulbs to fit.
The first two replacements worked fine. When I turned on the switch after swapping in the third, the circuit breaker blew. I turned the breaker back on, and it immediately turned off again. I removed the bulb, and turned the breaker back on. Then I turned the switch back on, and none of the ceiling lights lit. I've now cycled several times through the breaker and switch, and it's definitely not working.
I've removed the sheet-metal cover thing from the recessed lighting fixture, so now I have the light socket itself hanging loose by its wires. All the wires still look firmly connected.
I'm pretty sure electricity is still coming to the circuit, because the switch itself has a very dim light behind it that turns on when the switch is turned off, and when the breaker is turned on but the switch is off, that light still lights up (it turns off when the breaker is thrown).
I'd rather not have a simple light bulb switch wind up with a $200 electrician visit. What could have gone wrong?
ADDITIONAL INFO 1: I'm pretty sure the dimmer switch has failed, but also that it is not the only problem. With the switch connected (on or off), the breaker can turn on and off without any problem. I bypassed the switch entirely by just connecting past it (so the power is always flowing past the switch) and now the breaker pops immediately if I try to turn it on. (note that the first time I tried turning the breaker on with the switch still in the wall, the breaker popped, but now it doesn't. I think I fried the switch by trying to turn on the breaker a few times while it was still connected and shorted.)
So the switch seems dead, but even bypassing it entirely, there's still a short. So somehow I perhaps damaged the socket itself? I borrowed a multimeter from a friend. With the breaker turned off, I switched the multimeter to measure resistance and touched the leads to the input and output contacts on the back of the socket (no light bulb in it). The resistance wasn't zero, but it dropped from infinity down to a few dozen resistance-thingies. So perhaps the socket is damaged as well?