Hi all, it would be good to know what was the previous BIOS version. When updating the BIOS we recommend incremental updates; you may skip few versions (depending on BIOS versions) but it is better to continue doing the update in increments in order to avoid this type of issue.
The Intel® 6 Series motherboards have specific update instructions that are explained in the article below.
Desktop Boards — Updating the BIOS to support 3rd Generation Intel® Core Processors
You may want to try removing the CMOS battery for thirty minutes and try a BIOS recovery again. If you do not get the expected beeps without RAM/VIdeo the only thing left to do is checking if the motherboard is still in warranty so you can contact Intel® support for replacement.
I am truly sorry for this inconvenience.