I would be checking for power and grounds at each fixture, like the rest said. Short of that is it possible that the on/off switches were turned off on the fixture itself..?
I might even pull the light fixture off the ceiling and check the wires coming in.
Glen & Robyn (A.K.A. Puff & Crickit) Full Timers..
2006 F350 6.0 with 3.73 gears, 4X4, Extra-Cab Long Box, Oil/Tranny/P.S. Coolers. Coolant filter. SCT Livewire.
2011 Cedar Creek 36RE, Auto levelers + too much to list..!