have a pentair pg 2000 fiber optics light on the pool., quit working last year, thought it would be the bulb burnt out. ordered new bulb still did not work, i sent the bulb back and they replaced it and it still did not work so i'm going to have to have someone look at it. would like a heads up on what might be wrong. fan comes on and the color wheel turns. changing the bulb is about the extent of my electrical talents.