[m463]

I know I shouldn't be surprised, but how can that keyed connector get forced in backwards? That is mind-boggling.

[nielsbot]

The metal shell of the 6-pin socket has a seam where it's closed, and that can open or loosen with use. That makes it easy (enough) to plug in a connector the wrong way.

Trivia: Pretty sure the 6-pin FireWire connector was inspired by the GameBoy link cable connector. https://en.wikipedia.org/wiki/Game_Link_Cable