Totally feel you on this, had the same head scratch moment myself lol.

So how many times did you walk past that PSU at the store and say "eh, it's still working"? Ten years is like a dog in people years, that thing lived a full life and then took everybody down with it. Honestly the pop was just it saying goodbye. Bad part is the PSU almost never kills itself alone, it likes company. Next round grab a cheap tester or just swap it every five or six years, way cheaper than a new board.

That woman deserves a raise... or at least a cut of your savings.