OK, probably something simple Im missing, but I have a fixture in the kitchen thats a 4 bulb unit. One day, it stopped working, then a few days later finally came on when turned on. Then it just stopped working. all 4 bulbs would not come on. So.. I first checked the power. 120v from the source when the switch was flicked. So powers not an issue. The I did a continuity check on all the bulbs...all good. BUT, from what Ive learned, they could still be bad. I replaced the ballest and still nothing!! So, that tells me that its one, if not all of the bulbs. Can one bulb affect three good ones and not come on?? Anything else i should check? I dont have another fixture to check the bulbs in other than taking them all to LOWES and checking them.