The JerkStopper keeps your power cord in place, does little else {Engadget}

Jan 21st 2008 2:19AM atrain: a 3,5mm jackplug? (like in audio) I would expect there is a serious probability of a short circuit/negative polarity when you insert the adaptor :\

I changed mine to an external DC-jack, and it works flawlessly. (complete with bomb looking black and red wire extruding from laptop, the airport liked that.)