Check the fuse (look in the manual to see which one). That's step one. When you look in the manual to see which fuse it is, check out what other components, if there are any, run on the same fuse, and see if they are working. If the fuse is ok and all the other components are working, then you might need to pop out the trim piece that goes around the dome/map lights and see what's going on, like loose harnesses, cut wires, etc. I'm assuming since you haven't had the car long that you've never done that, so maybe they got disconnected for some reason. Check the fuse and give an update, we'll go from there.
I feel like Dr. Quinn.