I'm not suprised its not booting if you have just changed the fsb to 133 as that would mean your processor would be running at 12*133, or 1.6GHz :Q
You need to clear the bios so that it returns to its default settings, which may be by connecting a jumper on the mobo, pressing insert while starting it, or unplugging and taking the battery out for 30 secs.
To run at 133Mhz you should decrease the multiplier to 9x.