same board as me mate, has this just happened or did you add / change any hardware?
OK, So i had a similar problem after my PC had been off for over a month (moving house). When i booted i got various bios errors, system auto reboot loop etc. This continued even after I had flashed the bios.
What I did to solve it was to remove all but 1 of my sticks of RAM (i had 4 x 1GB). Booted fine with 1GB, so i shut down and added the other 3 back, problem gone.