The green light does not mean that all of the power supply voltages are OK. But did you ever check them?
Ok, that’s kinda what I thought: A system to check that all power supply rails are working properly and then display a green LED if “yes” (sort of like NOT having your check engine light on) would require a separate bit of circuitry and perhaps a little logic circuitry, plus an independent almost fail safe power supply of it’s own.
Quite doable - heck, with a little “refresher study” and / or a little help from people over at All Circuits, I could probably whomp up such a module myself. But I’ve not seen it in any computer I could afford.... Besides, as a diagnostic tool it’d be better to have separate LED’s for each rail.
Anyway, I’ve not had a chance to put a multimeter to the supply rails, as I’m still not back home, and in the meantime, wifey heard from a friend who’s in a tight spot and needs to sell their car — and wifey wants it, and it looks like she has enough savings to pull it off, but she want me to check it out and handle a lot of the stuff involved with such a purchase. So the computer will have to wait a couple more days...