What has happened to my Mobo/CPU while OCing Phenom II 940?

I was configuring a simple overclock (3.5GHZ) on Phenom II 940 paired with an MSI K9N2 Platinum board when my system shut off entirely. I had only adjusted the multiplier and upped the voltage to 1.45. I have an Antec 900 case and Sunbeam core contact 120MM CPU fan. Temps were showing in the low 50s C before the crash under prime testing. The system will not turn on now, the lights on the motherboard light up when the I/O switch is on, but the case power button does nothing unless I unplug the 8 pin power connector to the motherboard, then all the fans spin and components appear to come to life, but obviously no post. My question is... is the motherboard partially fried, or is the CPU done for? What could be causing these symptoms? I don't want to plug another CPU in if would place it in harms way as well.

I have tried clearing CMOS etc.. something hardware wise is definitely wrong.

Take the cpu to a local shop and see if they can post it.

Tried another PSU, MSI board shows the same symptoms, also tried different RAM - it has to be the motherboard correct?

The MSI board does have an 8 PIN 12v connector, so I connected the 8 pin from the PSU, could this be the issue? is it possible to connect only the 4 pin and power it, even if it has an 8 pin connector on the motherboard?

Its an Apevia Aqua Power 700 watt, 58 amps over 4 rails

Haha, yes of course obviously, its 2 4in pins linked like a 20+4 pin, so you cant mess up.

But I tried a different PSU with both 4 and 8 Pin connectors and similar wattage/amps and the same board symptoms resulted - this would mean it isn't the PSU. Furthermore, the PSU powers on all the fans etc.. when the 8 pin is disconnected, so the 8 pin connection must have fried.

Your mobo is busted.

come to think about it the mainboard cpu is limited to 140watts, overclocking to high and setting the vcore to 1.5 caused the overload on those chips