Thanks everyone. I checked the wire. I am sure the bulb is burnt out. I think i have to get the new light unit. If I can get the bulbs that will be great since i will buy a lot of them. I know they probably will not cost a lot. That is better than buying the light unit although it is not expensive. But still if you have alot of those bulbs you can replace them easily without buying a new unit everytime the bulb burntout. Thank you for the advise.