Sounds like a simple solution problem (switch, breaker, etc.). I'd suggest some things to try if you're comfortable working with electricity. But, most people comfortable with that probably wouldn't have posted the question.

Were you turning them on manually, or are they on a timer? Have you checked that all the switched are 'ON'? Is a breaker tripped?

If all the above checks out, you start checking for power with a meter from the breaker back towards the lamp. This is not something you do while learning about electricity. Definitely time to call in a favor or hire an electrician.