MacPro Lion refuses entering Sleep mode

Hi!
(note: I have a French version of OSX so all terms I use are My translation which may not be exact)
Since installation of OSX Lion I have problem with sleep mode:
- first time I found a cure on the net - I deleted one line in library ( just can't remember what exactly)
- this is second time and nothing I tried solved the problem: when clicking to suspend activity ITunes stops and screen turns off but never get the slow blinking  light on the front panel (and never hear the little click sound when it goes off).
Since the first time I experienced the problem I've installed a second hard disk where I've created a boothable copy of my HD - if I booth using the copy, sleep mode works OK.
If it has any meaning: I've noticed on «Console» that after clicking on "apple-suspend activity", there are numerous and frequent entries about Firewall (Firewall: Stealth Mode connection attempt to UDP ##.##.###.### from 216.55.184.20:14589 -the latter is only one of the namy different addresses that try to connect).
Thx

«What about a new user account?»
You suggest I create a new user account?
«What are you using for firewalls? 3rd party? LittleSnitch or anything else>? Your router provides most anything you could want from a firewall. »
I use Lion firewall and I do not have a router
«Safe Mode disables 3rd party drivers and doesn't load programs and processes. »
I've tried booting in safe mode - same problem persists.
«Sounds to me like a problem from installing and upgrading over an earlier OS - setup assistant on a new install has benefit of strating fresh, imports all your settings and programs, and also leaves you with - as if you had cloned only better - a dual boot setup where you can use previous OS. »
Right I upgraded from Snow Leopard but the first sleep problem I had (early July) disappeared to reappear in September.
Are there files I could compare between the default drive and the clone that could give me a hint? 

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