[G4] 2003 Dual 1.25 GHz won't sleep (USB)

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I have seen other people have similar problems with the operation of their 
G4s. They have reported that the problem is resolved as soon as they disconnect 
the USB hub that they are using.

If I remember correctly, most of the reports have dealt with non-powered USB 
hubs. I cannot remember any reports of powered hubs causing the "fail to 
sleep" problem.

I would suggest trying a powered hub as an experiment and try to duplicate 
the problem. If the problem does not appear, then you have found the solution. 
If it reappears, then try the other suggestions such as repairing permissions, 
etc.