Well you know what, I think this DOES have something to do with the voltage or power. I just managed to get into windows with 460FSB, 1.4V CPU Voltage (though Win10 crashed almost immediately after loading).Well..........that PSU is a time bomb. I've seen stranger things happen on a crappy PSU. I'd change that out and try again.
I'll try changing the PSU, how's the Antec VP500PC or Thermaltake TR2-550 PP?