I attempted to install a ceiling light in my bedroom. There was a pre-installed light box, covered with a plastic disc, containing a black wire, a white wire, and a ground wire. When I installed the light, I successfully got the light to work, however now the light in my closet (on the same breaker, presumably the same circuit) won't turn on. I've since detached the bedroom light from the ceiling, jimmied the wires around to try and reconnect anything that was disconnected, as well as fully uninstalled the bedroom light. Nothing has been able to get the closet light to come back on. Anything else I should try before I call an electrician?
As a note, the building was built in the 2000s, so old shoddy wiring is (hopefully) not the problem. I did use LED bulbs while testing the bedroom light.