Yeah.
There's a "snap" when one plugs the power back in, even with everything off. Power is going somewhere.
I think, too, that in this case moving the jumper was essential. I suspect there's a non-volatile memory of it somewhere that had to be interrupted, or erased.
How did you do? I find it always reasonable to blame Norton if there is even an old yellow box near my computer. Cheerios will do. And I'm usually right.
Arf