12V Light Fixture not Working

[Cheri Smith]

Has any one out there had a light fixture that suddenly stopped working? We have a fixture that is about 12 in. long and it has 2 florescent tubes in it about 10 in. long. It works on 12 v. power. Today when turned on, nothing at all happens. The tubes look good and are fairly new. It's just completely dead. All the other lights work fine. My question, is there a starter or some small part that went bad? Or, do I need to get a whole new fixture. If any one knows anything that may help, please advise. I'm not an electrician but can do some of the minor type repairs. Thanks for any help given.