could be a few things..the mb having a hard time setting the ram speed..try pulling out all the ram but one dimm.
you forgot to plug in the 4/8 pin atx plug near the cpu. you forgot to use the case standoffs and ground out the mb or the i\o shield is. try taking the mb out of the case and bread boarding it. the ram you have is the wrong voltage/amd ram or not on the mb qual guild. the mb cmos need to be updated...missing some code to boot right.