Any ideas on an electrical issue?

[Ray Harrell]

One of my tenants informed me that all the lights in the hallway (3 fixtures) are no longer working. The breaker is ok, and all the other lights on that meter are working fine. Any ideas what would suddenly cause this? The bulbs are fine as well.

[Jonathan Ramos]

Switch the breakers one by one to isolate that particular line. Once found check if there are other outlet/lights wired together on that breaker. If the other outlets/lights work then there may be a bad connection somewhere down the line possibly in a junction box or inside a light fixture if this is an old home.