Ok, to be fair, they did say "when we turned it on, part of it blew up" when I asked for more details, and it was just a 2-page schematic with 6-7 subsections. I think it was pretty fair, I'm just frustrated that it felt like I couldn't solve it by thinking slowly and methodically.

It was a really cool company and I'd have loved to work there. It's the kind of place where I want to be a good fit.