Artur,
Thanks for attempting to help, but unfortunately restart still does not work.
I read through your guides and tried many other options (null cpu pwr mgmt and more)
Still nothing on restart. I did find in the system log that sleep was being prevented by the firewire.
I disabled the firewire but the computer doesn't sleep the screen turns black and the system now is unresponsive almost like the restart issue.
let me know if you can assist with this further?
Thanks again for your time
-Richard