IBook won't completely shut down

I have a 1.2ghz iBook with 1.25 gig ram running 10.4.1.1 that will not totally shut down after you tell it to. The finder will quit and the screen will turn blue, but that is all that happens. To make it shut down, you have to hold the start button for 5 seconds, then it will turn off. I've run disk utility, cocktail and onyx, but still nothing. Anyone have any ideas?

If you have not tried the "Resetting PowerBook and iBook Power Management Unit (PMU)"
procedure outlined here: http://docs.info.apple.com/article.html?artnum=14449 to see if
the odd behavior can be checked and fixed, I suggest you could try the one they recommend
for your computer on that site. Also, note there are a few other things to try first, shown there.

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