I hope someone can help.. I have 2 DJ SCAN 250's.. One of them has a bulb burn out so I replaced the blub. Now when I try to use the light, the new bulb never lights. I have tried 2 different bulbs and also the other bulb from the working DJ Scan 250 light (I also tried the new bulbs in the working 250).. any ideas what I can do to get it working??