I recently bought a 620w power supply. It had two seperate 12v 4-pin square connectors. It was made so just one or both could be plugged in. This leads me to believe that 2 of the connecotrs would be suffecient.
The 8-pin power connector is on an EPS12V power supply. They generally break apart into two 4-pin segments but do not have to. The 8-pin connector is for use on Xeon boards, particularly dual- or quad-CPU setups. I built a dual-Xeon machine and it needed the 8-pin power supply in addition to the normal 24-pin ATX one.
ATX boards (which yours probably is as PD 940s are LGA775) take a 4-pin 12V power connector. If you have an EPS12V PSU, the 8-pin unit can be broken in half and one (and only one) of the 4-pin halves plugged into the motherboard with the 24-pin ATX connector. But a normal ATX12V PSU is fine for your chip, you do not need an EPS12V one.
I did attempt a system boot up with the current configuration and although power went through to everything, I had nothing appear on the screen and no usual HDD noises like you do during a boot-up sequence.
I'm hoping this is purely a PSU issue and not anything else.
Any suggestions? What replacement PSU does anyone recommend?