I don't have the Biostar mobo, so I can't really give you the exact problem/solution.
Did you check the FSB setting for the CPU (voltage) and other regarding to the "un-usuall" CPU?
Maybe some setting that make the combination won't work.
Also, what type of RAM are you using? If you are using onboard video card, make sure the RAM is not DDR400 (PC3200). Cuz the onboard video card/memory don't work with DDR400.