There was no lightning, just wind screwing around with power lines. Could that still cause surges?
At any rate, the computer worked fine for a few hours before going splat during a time of mild wind. That combined with the fact I'm currently 1000+ miles away from the computer in question and thus unable to test things much means I'll assume everything else in the computer is fine.
And since I've been thinking I should get a new power supply anyway, but not enough to actually do it without it breaking first, I think I'll take advantage of this opportunity.