hmm wait for a while after u power it say like 30 sec
if not boot shut down
press power + then reset
hold that for 20 secs and while holding let go of the power button.
the mobo will shutdown hence let go of the reset and it will restart in default.

where did u buy ure mobo from..

like the distro here has the dfi bios flashing tool.
can just return it to them and they can flash the bios back and boot it back up easily.