A lot of the 1.2's were unlocked; I would just go into the bios and up the multipler one half and see if it is. If it does then at least you know the chip is unlocked. On the MB by the cpu is a jumper to set you chip at either 100 or a FSB of 133. If your board comes up with speed of 900 then you have a 1.2 with a 133 FSB and you need to change the jumper to 133.
Anyway you need to give us more facts about the chip and what bios version you have.