Computer no longer Sleeping

I have an iMac G5(2nd Gen) with Leopard (10.5.3) and my computer will not sleep no matter what I do. I tried ejecting all external drives (Firewire and USB), turning off all USB devices, disconnecting from my wireless network, quitting all running applications including ones running in the menu bar but it still will not sleep. It will sleep manually by going to Apple Menu-->Sleep but if I try to set it up to automatically sleep in Energy Saver it will not. I also did some research online and found that HamachiX is a known for this but I don't use that program. I use LogMeIn Free but I quit out of it for the past three days. If I look in my console logs it says this.
Jun 21 10:11:24 The-Big-Green-Machine tuncfgd[7783]: tuncfg: already running, use 'killall tuncfg; tuncfg' to restart it
Jun 21 10:11:24 The-Big-Green-Machine com.apple.launchd[1] (tuncfgd[7783]): Exited with exit code: 1
Jun 21 10:11:24 The-Big-Green-Machine com.apple.launchd[1] (tuncfgd): Throttling respawn: Will start in 10 seconds
Jun 21 10:11:34 The-Big-Green-Machine tuncfgd[7785]: tuncfg: already running, use 'killall tuncfg; tuncfg' to restart it
Jun 21 10:11:34 The-Big-Green-Machine com.apple.launchd[1] (tuncfgd[7785]): Exited with exit code: 1
Jun 21 10:11:34 The-Big-Green-Machine com.apple.launchd[1] (tuncfgd): Throttling respawn: Will start in 10 seconds
Jun 21 10:11:44 The-Big-Green-Machine tuncfgd[7786]: tuncfg: already running, use 'killall tuncfg; tuncfg' to restart it
Jun 21 10:11:44 The-Big-Green-Machine com.apple.launchd[1] (tuncfgd[7786]): Exited with exit code: 1
Jun 21 10:11:44 The-Big-Green-Machine com.apple.launchd[1] (tuncfgd): Throttling respawn: Will start in 10 seconds
Jun 21 10:11:54 The-Big-Green-Machine tuncfgd[7787]: tuncfg: already running, use 'killall tuncfg; tuncfg' to restart it
Jun 21 10:11:54 The-Big-Green-Machine com.apple.launchd[1] (tuncfgd[7787]): Exited with exit code: 1
Jun 21 10:11:54 The-Big-Green-Machine com.apple.launchd[1] (tuncfgd): Throttling respawn: Will start in 10 seconds
Anybody have any idea what that means or why this occurring. Thanks in advance.
Message was edited by: Krasi

I tried what you suggested and even reset the PRAM to see if that would do anything and neither worked. I also turned off all screen savers, turned off bluetooth, disabled all startup items, and even tried a different partition i have with a clean install of 10.5.3 and that didn't sleep either. It it seeming to be more of a hardware issue but I am not sure. I went through and disconnected all my devices again just to try and still it fails to sleep even on the clean side where no apps are installed and nothing has been modified. My comp is out of warranty so if it is hardware I am stuck with it until I get a new machine. Anything else you can give me to try.

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