1. put in your old (working) cpu.
2. go into bios, set auto mutliplier and 100MHz FSB.
3. put 'dead' chip in
4. boots then its ok, if not then id say its dead
for it not posting it could be that it is locked and you have the wrong multiplier set, or that the FSB is too high. by testing your old working chip you know that nothing else is at fault either.