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Just to be certain, since I know no spike of power got to the Xenarc through the power wire (fuse still intact), is there any way to smoke the thing like I did through the VGA cable? Or is it likely a VERY ODD coincidence?
A quick google of VGA pin outs shows they have a gound pin. There is a chance that because of your possible poor ground for the CarPC, it then tried to gound through the VGA pin, and thus through the screen. However this is well beyond my knowledge of PC, VGA and LCD screens.