If after replacing your processor the machine does not power up, I recommend you to perform couple of steps.
1. Clear CMOS, more information about clearing CMOS is available here
2. BIOS recovery. For instructions about it go here
basically, just download a .bio (SO4598P.BIO) file off of the Intel web site, put the file onto an USB flash drive, Remove BIOS jumper and power on... let the process complete all way through