G4 MacMini won't sleep or shutdown after update to 10.4.8

Since updating using software update to 10.4.8 on the logout screen I mostly used the "Sleep" option after logging out from my account. To begin with things seemed fine, but now, it won't go to sleep. If I click on the button to sleep the computer, the controls get greyed out for about 30 seconds to a minute, then return to their normal state - but the computer does not enter sleep mode.
Shutdown doesn't work either! I had to hold the power switch on the back down for a few seconds to force it to switch off. Interestingly, the internet connection light on the router was flashing irregularly while I was waiting for it to switch off.
I have reset the permissions (only after the install, not before), reset the PRAM, and searched the system preferences to see if something is glaringly obvious as being wrong but have found nothing and no have no further clue what I can do...
Is it related to my not wanting iTunes to provide Album Artwork at all? For some time, every time I opened iTunes it demanded I update my Album Artwork, but I don't want to and don't have an iTunes account. I had put off downloading both 10.4.8 and iTunes 7.0 for almost a week - until software update failed to provide a Cancel button for me to refuse again!
How can I get sleep and shutdown to work properly?
MacMini, PowerBook, PowerMac G5 DC Mac OS X (10.4.8) Mac OS X Server 10.4.8

Problem Solved!
I copied the combo update over the existing system but this alone changed nothing. Because I was unsure of which of my seemingly many OS X disks to load I rang Applecare (thank God I signed up for the three years of extra phone support - a real bargain) and they suggested I do a PMU reset - after which everything worked fine - so far.
They warned me about not doing a PMU reset very often (I guess the PMU can only stand a certain number of these events before breaking). In order to do one follow these steps:
1) Switch off computer;
2) Unplug ALL leads and power cables to the computer;
3) Wait ten seconds;
4) Simultaneously hold the power on button down while plugging the power cable in to your Mac;
5) Connect your other cables.
6) Switch on and go.
For me, this fixed all my other problems - Sleep, Restart, Shutdown, Printing, iSight, Internet connection speed, Quick Time performance, and so far I haven't seen anything else wrong to fix. Hopefully there won't be anything else to fix!
If anything does go wrong after this, I will do the Archive and Install, which was the next suggestion from Apple which I did not need to do. So far.
Thanks to all those who gave suggestions, I appreciate your help.
Thanks,
Mac

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1st Indication of a Problem--
While using "Software Update" to upgrade from 10.4.8 to 10.4.9, the computer screen went black about 1/2 way through the "system optimization" part of the installation. I thought it had just gone to sleep since the white sleep indicator light was glowing on and off. However, I could not wake it from sleep and the only solution I found was to hold the power button down to fully stop the computer. Then, I powered on again to have the computer try to start up, and then go black during the gray screen. I repeated the process and each time it would get a little further into the startup process, but it would never finish loading.
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http://www.unsanity.org/archives/macos_x/shock_andawe.php
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