I have a combo lite fixture with 2 incandescent and 1 fluor sockets. The incandescent lights are fine, but even after changing the fluor bulb, the new fluor bulb won't light. It is not loose in the brackets, either. I don't see any way to check the starter, I don't even know where it is in this type of fixture.

Anyone have any ideas as to making the fluor bulb in this work? Thanks.