Thanks for the help guys but it turns out my problems were related to a dodgy PSU. Over the last week I kept getting sporadic reboots up to the point where the damn thing wouldn't even post! New PSU and everything is working perfectly....even on the latest BIOS!!! Weird that a dodgy PSU could cause BIOS issues but hey, I ain't complaining now it's all going well. Time to do some proper testing now .