Classic BIOS update gone wrong. If it will not POST (try the usual stuff, take everything out but CPU, Video Card, 1 stick of memory) Clear the CMOS by removing the battery for 10 minutes or so.
If nothing works, you are now the proud owner of a dead motherboard.
Nothing you can do but return it if the BIOS chip is not removable.
If it is removable, you can contact ASUS for a new BIOS chip.
Good luck with the motherboard, and trying to get hold of anyone at ASUS as well if you are going to try for a new BIOS chip.