I have an intel board I got off ebay to build a hackintosh. Well I have used known working good CPUs proper stock intel heatsink/fan units, and several sticks of known good memory to no avail. I have used two power supplies, both good, one is new, and I have cleared the CMOS. All it does when you fire it up is the CPU fan spins for 30sec to a minute, then i powers off. The people who I got it from are willing to RMA it, but they also claim they test them. I really feel like there could be something I'm missing, but I am clueless as to what?!?