Solved! Mounted a Intel 3820K on the motherboard and it booted succesfully, after that updated the bios to the latest version 2.4 and after that it works with the 4930k ! No more FF's ! By the way the bios on the motherboard was the oldest one. From what i read the Big Bang Xpower II should support the 4930K from bios 2.3 and newer. Thanks for the sugestions.