As I currently own a mvp 2 ,svd I currently have had no issues out of mine but for it to just brick like you have decribed makes me think its more then likely the CENTER PIN. Has been pushed down and if that is the case it will not turn on or fire untill you pull the pin back to the correct position. I had this happen on the svd I thought it was dead but after pulling the pin it was perfect after the fix. It's usually caused be overtighning your tanks
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I am real .... about how tight I snug my tanks. In fact with all of my 510 tanks I tighten them until they touch just enough to make a connection then snug my beauty ring up against the tank.