Wakes from sleep by itself

I have a 20" iMac (Intel Core 2 Duo) and an issue appears to have started after the recent software update (not sure if this is the culprit).
My iMac wakes unexpectedly after being at sleep (sometimes after 10 mins sometimes a bit longer). I have NO bluetooth devices attached (and bluetooth is off anyway) and I do not allow bluetooth devices to wake the computer.
I also have the "Wake for Ethernet..." unchecked. I have also tried to trash the com.apple.PowerManagement.plist file and rebooted. And also have run Onyx to fix permissions and run the maintenance scripts.
I just say someone on a different forum post that they too are having this problem with new iMac. Anyone hear of a fix or suggestions as to what may be the cause?

Steve,
Okay more advice. If you go to: http://discussions.apple.com/thread.jspa?messageID=1849881&#1849881
you can read the advice suggested but this one looked really helpful posted by Dale Welsshaar:
This is for a Mac that won't sleep.
First, read things in Apple doc.#25801 on sleep settings.
USB devices and hubs often cause Macs to not sleep or wake quickly from sleep (notably HP printers and scanners, HP all in ones, and Cannon scanners). Disconnect all USB except for keyboard and mouse and try. If it sleeps, add one back at a time testing after each one to find the culprit.
If you've set your Mac to recieve faxes, it may not be able to sleep. It might also have a damaged preferences file.
If you use your Mac for faxing, open System Preferences. click Print & Fax, click the Faxing tab, and uncheck the Recieve Faxes On This Computer box.
If that does'nt work or you've never faxed on your Mac, go to Finder/Hard Drive /Library/Preferences/SystemConfiguration and delete the com.apple.PowerManagement.plist and com..apple.AutoWake.plist files (if your Mac asks, type your admin. password).
If the latter file isn't present in the folder, go to user name(probably your name)/Library/Preferences, delete the com.apple.systemuiserver.plist file, and reboot your Mac.
Hope this helps!
P.S. One member here reported this (Michael Gleason);
"I have had this problem with my IMac G5. It is surprisingly irritating. LaCie's Silverkeeper backup software was the cause. By default it gave itself permission to wake up the computer to check if a backup was needed. Do you have this or a similar program installed which has scheduled activities including wake-up permissions as an option?"
Dave Hamilton provided this link, xlr8yourmac.com, to a member, which addresses failure of deep sleep with some users that updated and added new FireWire and USB cards.
Cheers!
DALE
Hopefully this will help you out even more,
S.

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