I got a known working power supply and did this:
Took out cpu but left cpu heatsink fan plugged in. The boards leds turned green and the sys fan was blue but the cpu fan did not spin. Board just sits idle as if all is ok.

Plugged in cpu and fan and system boots and cpu fan spins for about 3 seconds then board reboots and red led ACPI4/5.

Is it the board or the cpu ( brand new from Newegg)?