maybe you got some AS on some of the bridges of the processor. Since AS is not conductive it wont short anything out but since its capacitive, it may interfere with correct functioning. so check if you got AS in any places where it shouldn't be.
If you can't change the bios settings anymore, you may have bios corruption. It happened to me last night, I was playing with a locked chip and when I hit 176 FSB the CPU suddenly started to boot at 1400MHz, with a weird 114MHZ FSB - which I could also not change anymore. I had to reflash the bios, then all was fine again. Guess 176 is too high, so I stopped at 175.