david i just wanted to point it out if you read from asus own web page.http://www.asus.com/Motherboards/AMD_AM3Plus/SABERTOOTH_990FX/#CPUS
bios 0402 was the first shipping bios. if you look down it says bios 815 is needed for your mb to post with the new cpu. is there a bios sticker or info on the box that says bios 815 or higher was loaded. if it does i would see if the mb is shorting out to the case or cpu cooler. i would try and see if it boots with the mb on a flat desk.