IBook Will Not Automatically Sleep

Lately I have had a problem with my iBook G4 not automatically going to sleep after the specified period of time. Obviously this is a problem when running on battery power! I usually have it set to sleep after 15 minutes of inactivity to save the battery, but it will not go to sleep. I'll come back a few hours later to a dead battery. It does sleep when I shut the lid, and it goes to sleep fine when I select Sleep from the  menu. It will also go to sleep when the battery is low (about 2%). It just will not sleep after the interval that I set.
I have tried the following:
Deleted the powermanagement.plist file then rebooted.
Verified the HD and repaired disk permissions both from disk utility and install disk.
Tried the cmd-shift-option-power reset option after shutting down, still the same...the iBook will not go to sleep on its own.
No software is running, no additional RAM has been installed, and this happens on both battery and AC power. Any thoughts?
iBook G4, 12" 1.33 GHz Mac OS X (10.4.9)

Restart and hold down on the "shift" key until you see the spinning gear icon. This will startup the iBook in "safe" mode. Test to see if the iBook sleeps normally now. If it does, then you have some kind of third-party software conflict. If it doesn't, then you might consider resetting the Power Management Unit:
http://docs.info.apple.com/article.html?artnum=14449
"cmd-shift-option-power" is not the same thing as "control-shift-option-power"...
-Doug

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Jack,
Welcome to Apple Discussions.
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Libellen wrote:
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The Update would not have Installed if it was not suitable for your Device.
Libellen wrote:
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my dear friend i have like your problem before and when i see alot of solution i find the one it work with me and
come autmatic again
take the solution:
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