This is probably a silly thought, and most likely not the issue, but throwing it out there because you never know...(and it happened to me).

Any chance the gray one has an automatic transmission? Mine does, and I accidentally shut the engine off with the gear selector on N or R, don't remember. Then went to start up and same thing happened, it clicked and dash lights went on, but starter motor wouldn't turn. I checked everything, it took me a while to realize it was in gear, because that the last place I thought to look at, but then I did and put in Park, started right away.

Hopefully that's it!