Won't sleep when scheduled to.

My Imac is working fine. Except that it won't go to sleep when scheduled to anymore. Any suggestions on how to fix this problem?

I haven't plugged in anything new into it or installed any new software. So i don't know what it could be. I tryed zapping the PRAM. Didn't work. I tryed resetting the PMU, but iam not sure if that worked, because my clock wasn't reset. So i don't know what wrong.
You say that you haven't installed any new software, but I see you are running OSX 10.4.4 Did you recently upgrade your OS to this? If so, then it is possible that either an external device or other software also needs to be updated to reflect the change.
I tryed resetting the PMU, but iam not sure if that worked, because my clock wasn't reset. So
There is no PMU reset available for the iMac G5 - instead they have an "SMU". Resetting this doesn't affect the clock.
Cheers
Rod

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