She then asks me where the switch is to turn it back on. I have no idea, of course.

Of course, as you do computer stuff, anything regarding cables is your expertise and responsability. Been there.

Anyway, as others have already said, this story says something good about the human quality of this person that, after realising their tantrum was inappropriate, called back and apoligized. Even more so if they're going through something.

We live in a very stressing world.