Basically the Power Management Unit (PMU) gets into an incorrect state. It is much like a program crashing and taking the OS with it. In both cases you have to reset to clear it. There is a PMU reset key sequence but I have found it doesn't always work. Disconnecting the AC Adapter and removing the batteries leaves only the PRAM battery. Pushing the power button puts more of a load on the PRAM battery than it can supply (AFAIK there is a protection circuit to avoid damage). This removes all power from the PMU which resets it.
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You know when it did it to my Wallstreet, unplugging the AC adapter and removing the battery and pushing the power button wouldn't do it. I'd push the button and the light would go out momentarily, but the instant I let go of it, the light would come back on. The only way I could get it to go off is leave the computer alone (with battery removed and AC unplugged) overnight.
John
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