Steve
I am sure (I think) that you have tried pushing the button more than once. I know that it sometimes takes a few pushes to turn it on, but I have never heard of it turning on (the light), but not doing anything.
Oh, I just thought of something. Sometimes someone will knock off the little vaccume hose under the hood if they are doing other things there and once that is put back on, it will work again. I hope that does it. Let me know.