Ok, measured resistance across positive and negative terminals... open circuit. So obviously something is broken.

I pulled the speaker wire plate off the back, there's a board with electrical components and then 6 wires... one black, 2 blue, 2 white one red. There does not appear to be anything melted. I sniffed it and no whiff of burnt components on the board. Also, it does not appear any wires have separated from the board....

So what does that leave as a possiblity? I'm not sure what a 'crossover' is. I recognize a couple of white rectangular resistors, two cylindrical caps, another cap and then a couple of coil looking items, one open center and the other with metal plates running through the center... Is that last the crossover?

How do I test a crossover to see if its good?

I had the speakers a year or two before moving out of my old house back in 2004... so I'd say I bought them sometime in 2002 or 2003 timeframe which would make them 8 or 9 years old. Well out of the 5 year warranty period.