I have a Stage Setter 8, which had been working for the last 10 years plus. Not this year. First problem are the dp-415. Some of the fuses are blown, and I had since replaced them all. Right, now, all the channel lights on the controller are not lit. The dp-415 channel lights are also not lit. I only have black out and all on with 4 lights. No dimming effect at all. I read the previous posting that someone mentioned to try the "polarity switch" Is that a physical button? Or something else? I cannot find anything like that. Any help is greatly appreciated. The show is in about 5 hours.