IMac won't go to sleep

I have an iMac PPC G5 running OS 10.4.11.
No matter what I do I can't get it to go to sleep when it is inactive. I've set the Energy saving preference to put both the display and hard drive to sleep after several minutes of inactivity. I turned of the wake modem activity option and the wake ethernet option but the iMac still won't go to sleep when it is inactive.
I'm connected to the net by DSL.
How can I fix this problem?
Thanks Panther

BDAqua and AcEvergreen... thanks for your posts.
I forgot to mention in my first post that the problem is really with the hard drive. The display will go to sleep but the hard drive will not.
So I unplugged everything in the back except the keyboard and the DSL ethernet. Then I set the Energy Saver preference to sleep after one minute (with the HD sleep option checked) and I waited. The display went dark but the HD did not spin down.
Then I unplugged the DSL line, restarted and tried again with only the keyboard connected. No printers, ipods, USBs, firewires or ethernets. Zip. I waited about a minute.
Again the display went dark but the hard drive did not go to sleep. When I touched the keyboard the display woke up right away but there was no change in the HD since it was already spinning.
Any suggestion as to what is wrong with my iMac? Why can't I get the hard drive to go to sleep even when nothing is connected to it and even when I tell it go to sleep after X minutes of inactivity?
Thanks, Panther

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