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I suggest you guys take your TV's into a repair shop like Sears or Best Buy... The main reason most plasmas go dark is because of decay, but I don't think this is the case. Because what you describe is similar to what happens in LCD's when their back light goes out. Although you can open up and repair the back light your self in a LCD, I would not advise you to do so for a Plasma, because of the hazardous chemicals used in the plasma display plus the fact that plasmas don't use back lighting. And 2 years is way to soon for decay to be a factor. So more than likely a circuit shorted out and the TV has to be opened up to be repaired.
In a nutshell, there is no solution to this problem. The new Insignia TVs have a compatibilty issue with certain HDMI connections. The best thing is to return the TV and purchase another brand. I bought the LG w/built-in DVD and everything works great.
I wrote an in depth guide (with pictures) about how to fix this issue - it's really easy! It only cost me £1 (about $2) to fix.
You can download, print and view the guide here
My set started having sound issues recently. Every now and then, randomly, I get a split second, static sound. It sounds like an old record player when it skips. It happens on all channels HD and digital. Also happens when I'm watching a DVD. This leads me to think that it's not my cable box (Dish Network). I have a Bose 321 aux amp plugged in. I hear it through my aux speakers, as well as directly through the tv set. Not sure what to do. Is it possible my tv's amp is burning out? What could be causing this?