which bios were u using? the one by wicked or by wildgunman? if u used the one from wicked posted by sleepeeg then so iam not surprised, since it wasnt even zipped with winrar or sumthin. i hope u know that downloadin an unzipped modified bios is risky since slight changes caused by downloading process can have a huge impact. u should use wildgunsmans bios instead. besides this downloading issue i dont see any connection between these cases of dead boards and a modded bios since all it does is unlocking hidden features.
gl anyway