Well, the only thing I can suggest doing is the usual, pull all but your video, ram, cpu and see if if boots. I have the onboard sound enabled. I'm able to boot and run stable up to a 145mhz bus, anything over that, and the cpu will not post, I have tried with the voltage cranked to max in the bios, but havent tried the voltage mod on the processor, so that may or may not help. Other than that, I would guess you may be one of the unlucky few who just received a not so overclockable cpu.