When you change the CPU, ram or any other component in your system you must clear the bios settings by resetting the CMOS. Usually this is done by removing the CMOS battery for a few seconds.
If you miss this step it's possible that bios settings left over from your previous hardware are so incompatible with your new hardware that they won't start at all or even get damaged.
Does your computer still have a floppy drive? It's still the most reliable way to flash bios (going into dos prompt on floppy). The ez flash 2 is supposed to have a bios udpate utility within the bios so you don't even need to boot into the OS, just go to bios settings, choose ez flash, start it and read the new file from a floppy.