I understand that your system stop posting after a BIOS update.
At this time it seems like your CMOS got corrupted. Currently I recommend testing the system out of the chassis on top of a non-conductive surface. Also while you are taking the motherboard out of the chassis, you can clear the cmos by removing the power cables from the motherboard and the cmos battery for an hour.
After this, test the motherboard with no RAM memory installed to check if you get beep tones, if you don't you should get in contact with your local warranty department.