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    Macbook Pro Retina 820-3332 Instant Death after powered USB plugged in. PLEASE HELP!

    820-3332 is now dead, I get no light on the charger. The board does not increase in temp. I got 20v coming in from my 85w adapter and g3h is active at 3.42v,,. I am fairly new to this so any info given in dummy format would be much appreciated. someone mentioned the USB power rail but I cant...