Imac won't wake from deep sleep

This just started a week ago- in the morning after my Imac has been asleep for a few hours, I will try to wake it by pressing the keyboard or mouse and nothing happens- powerswitch is unresponsive, I eventually have to unplug and replug to start it up. During the day it will sleep and awake normally, it just seems to happen after long periods of time. The only thing I can think of is recently there i installed an Itunes update, could this screw things up? I have a (pre intel) IMAC running OSX 10.3.9 -1.6ghz and 512MBSo far I did the following:
1. ran hardware diagnostic test from CD (passed)
2. Zapped pram (command-option, p and r during start-up)
3. File system check (fsck -yf)
4. Trashed powermanagement.plist preferences
5. Deleted system cache and repaired disk permissions
6. Reset open firmware ( reset-nvram, reset-all)
This morning I tried to wake up the imac and the same response, nothing. Sleep light pulsating, but when I touch the keys, there is no response, the imac seems to do into a deep sleep. I had to unplug and replug again. Is there anything else I can try?
This all seemed to start when I installed the latest security update and newest Itunes, could this be a connection? If so, is there anyway to uninstall these?
Imac G5 (pre-intel) Mac OS X (10.3.9) 1.6ghz/ 512MB

Henry, there are reports of problems occurring with updates, I don't think you can un-install the Security update, and as far as reverting to an earlier version of iTunes, well, you could try and extract an earlier version from your receipts folder, but I would hesitate to mess with iTunes, you might lose your entire library.
What I would recommend is an Archive and install, or perhaps an upgrade to Tiger.
Let me know what you do,
Miriam
P.S., if you'd like, go ahead and click the "Helpful" or "Solved" buttons on any of the posts / replies above if you feel they were helpful or adequately answered your question.

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