When you try the third in any socket and it doesn't work, is is just that one you are trying that goes out, or do they all go out? This is very weird for sure!
Hmm......then my guess is that one of the sockets is wired in the wrong polarity. From my understanding, LED bulbs are kind of like a diode --- current can only flow one way through the bulb. Incandescent bulbs don't care about the direction of the flow.
Good luck!
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