Here are some precisions : with NullCPUPowerManagement fans blows up until i manual reboot (4 sec on power). Without NullCPUPowrManagement it suspend but when i click on my mouse to get back on the system reboot to startup bios screen.
It now works. My recipe to the perfect working Lion 10.7.4 and Gigabyte EP45-UD3L :
1. Install 10.7.2 with Kakewalk 2. Update to 10.7.4 with Apple combo update - no reboot 3. Apply Kakewalk update 4. Remove NullCPUPowerManagement from E/E (back it up) 5. Check the option 'Start up your Mac Automatically after a Power Failure' in System Preferences --> Energy Saver 6. Get back to work! ;)