Hi,
i am using a DH67GD B3 Stepping Board since 06/2011 in one configuration as my desktop home pc.
I changes nothing!
BIOS is 0160.
Today, all 
USB 2.0 Port stopped working, only the Renesas USB 3.0 Ports are working.
I tried: Loading Setup Default, Replace the battery, a new battery, i opend the case to check the cables, but i can not find anything.
A few weeks ago i had have the problem, that my ODD was missing after cold-start. I changed the SATA-Cable and it works again. It is plugged into the SATA_3 (SATA300 Port).
Could it be, that the H67 Chipset is faulty?
BR Maeckes