We have a bathroom light fixture that quit working one morning when I flipped the switch. I saw a spark in the light fixture and switch area. I have changed the switch and checked all the connections and still not working. I am not sure what to check next. Could the light fixture itself be bad?

That would be the next thing to check out closely.

Rwest, are you making your "checks" with a meter or just looking? With a meter it should be pretty easy to track where you have power or not. It may be time to call in an electrician. Good luck