The Ballast have burnt out.Switch off the trip or light switch feeding the fitting. Remove the Ballast and take the sample to a electrical wholesaler. The part is inexpensive and the job is extremely essay to do.
Charl
February 2007
Automatic Answer
While you wait for answers, we may have found some information which could help you.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix lighting.