BIOS 3456 is an old BIOS........almost a year old, dated 08-21-2009, not May 21st, 2010. Since then, BIOS 3712, 4905 and 5531 have been released. FYI, I am also experiencing Post 21 errors as well, but in my case they are intermittent. It started a couple of months ago, and is still occurring with BIOS (4905), although I do not know if it is BIOS related or defective hardware at this point. The IDCC stopped working as well and my keboard has failed occasionally on boot. This is the most unreliable Motherboard have ever purchased, and I do not even overclock.