Next day I threw the switch and it came up all --'s! (that's a good thing) Seems to be the opposite problem of a cracked ignition coil?
Ox, I've fixed many cracked solder joints that wouldn't make connection when cold, but would expand slightly when warmed somewhat, and work fine. So, yeah, heat may be the biggest enemy of electronics, but occasionally they fail when colder, rather than warmer. If you get some freeze spray from an industrial electronics supply, you can shoot areas of a board that you suspect to be bad, and often cause it to fail by chilling the bad joint or component, thereby identifying the guilty party.