Sleep Issues with g5 Imac

I have a g5 iMac running OsX Panther. 1.6 Ghz with 256 Ram.
Anyways, the computer randomly and frequently goes to sleep. The hot corners are not set for that, infact in the settings i've set it to never go to sleep. Some days, like in the last hour, the computer will go to sleep, i wake it up, and within a minute, it goes back to sleep. Some days it wont go to sleep at all. The problem seems to be truely random. The only programs running are Entourage, Safari and Adium, sometimes Itunes and Filemaker.
Has anyone heard of a problem like this before? Any tips or trouble shooting ideas?
Thanks.

First read Apple doc.#25801 on sleep settings.
A number of sleep-related issues can appear after incremental Mac OSX updates, including the inability to properly go to sleep, problems waking from sleep, and having your display go to sleep without your Mac going to sleep. The most common culprit is Bluetooth. Try these tips to fix your sleep problems.
WAKE UP
In System Preferences>Bluetooth, uncheck Allow Bluetooth Devices To Wake This Computer. If you are using a Bluetooth mouse and keyboard, you'll have to wake your Mac by pressing the power button.
FILE CORRUPTION
Your Bluetooth preference file may be corrupt-you'll need to delete it. Turn Bluetooth off, then go to the /Users/user name/Library/Preferences folder. Look for a file called com.apple.Bluetooth.plist and trash it.The OS will create a new preference file when you enable Bluetooth again.
ENERGY SAVER
If you have issues with a Mac or display that goes to sleep at inappropriate times, you may have a problem with Energy Saver. Delete the following .plist files and restart:
-/Library/Preferences/SystemConfiguration/com.apple.PowerManagement.plist
-/Users/username/Library/Preferences/com.apple.systemuiserver.plist--(username is your name or System Administrators name).
-/Library/Preferences/SystemConfiguration/com.apple.AutoWake.plist
A restart is very important after deleting these plists. After a reboot your Mac will then generate new ones.
Some, in these forums, have had luck fixing sleep issues downloading the Combo update from this site (yours may be corrupt), not Software Update, disconnect all firewire + USB devices except keyboard + mouse, Repair Permissions, re-install update, Repair Permissions again + try.
Yours could be the 10.3.9 Combo update (you did'nt say what version you are using). Others reading, download the combo update that applies to you!
Cheers!
DALE

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