You can power it up using a flat head screw driver to short the two pins that are connected to the Power Switch of the Case.
Yup, use only the Mobo, Processor and PSU for the first try to see how long it works.
Yup, those are the only cable you need to connect .
So I just bread boarded it - and still nothing. All that's connected are the 24 pin and the 12v 6pin, and CPU fan. Still getting the same thing - on for two seconds, off for five. I'll post pics of the CPU in a few minutes.