changing multiplier makes k7t pro2 not boot

Hey all, I have a msi k7t pro2 ver1 with a problem....

whenever I change the multiplier to anything but default in bios, it won't post. I've heard that this is a common problem, but I've looked and haven't found anything about it.

the funny thing is it worked once when I got it, then I did something, and it won't work now...

the chip is unlocked (tbird 700) and it can do up to 950, so that isn't the problem.

I'm open to any ideas.

thanks