Do you really thinks the problem is the MB, it might be the RAM, have you tried another memory brand to make sure it's not the RAM.
For the BIOS, if you got a BETA from DFI to try fixed your problem, it's not an issue. If you got an unofficial BIOS from nowhere, you only need to reflash your MB with the latest DFI official bios before sending it to RMA.
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A7N8X / <font color=green><b>Athlon XP 1800+</font color=green> o/c to <font color=green>Sempron 2800+</b></font color=green>
Kingston DDR333 2x256Megs
<font color=red>Radeon 8500 128Megs</font color=red> @ C:275/M:290 <- <i>It's enough for WoW!</i>