i sincerely doubt the board supports the new cpu, its not often an intel board will support cpus at both 90nm and 45nm, see if you can find out what chipset ur using, but ull probly have 2 downgrade to a 65nm core 2 celeron,
ps if a cpu is overheating, in most cases the pc will cut off, it wont just refuse to post because the system will still be supplying power to the cpu