Your m'board should take this cpu. Re-check to make sure the cpu is properly installed into slot and that all other steps taken to remove old cpu has been fully reversed. Check memory modules are properly seated and anything else that might have been bumped/knocked in the process. It is very commonly the simplest overlooked thing - we've all been there, more than once
Once you've re-checked everything and if it still dosen't boot, send it back for a replacement.