You are aware the unpowered visuals and associated events come from an Event Macro type actor used by the protoss buildings called Unpowered Anim.
The Variation2 is an alias set in the Combat: Custom Death - Name field that is used to refer to the value of the same index in the Combat: Custom Death - Model field. It could be whippedcream or any string you feel like.
Have you tried without the validating term under your events for now since that is more likely to be the cause of the problem.
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Considered easy altering of the unit textures?
http://static.sc2mapster.com/content/attachments/15/252/Screenshot2011-04-17_09_16_21.jpg
For my public assets look here!
http://www.sc2mapster.com/forums/resources/data-assets/46733-the-assets-of-evil/#1
ElBushido Regular ShmoeHey!
I made a tower that uses power like a protoss building would. I managed to disable its abilities when unpowered, but since its not a protoss structure it has no "unpowered" model. I was lookin at the fleet beacon for reference on how could I add 1 to it. So I duplicated "fleet beacon death unpowered" model added to my towers actor's "Custom Death-Model" than added "Variation2" in "Custome Death-Name" and added this event in the actor "even send" : Unit Death Customize ; term: ValidateUnit CasterIsUnpoweredAndNotUnderConstruction ; action: Death Customize Variation2. This is how the fleet beacon is set so i thought it would work (btw i checked stargate as well and its exactly the same only the model is different), but it did not. I looked around, but couldnt find how "Variation2" connects to the death model....