Asus motherboard problem

I am building a PC using the Asus P7H-55-M Pro. I installed the Intel i3/530 CPU. I bought the ram from crucial that matches this board. I cannot get a video signal. I tried swapping ram, same thing. Now, according to the Asus manual it states I have to use the 8 Pin connector EATX12V , shown in attachment. I have power supply 400w that has only the 4 pin. Has anyone here run into this and will my power supply work with this board. I have read on other forums and some say it will work with the 4 pin but nothing from Asus on this. My CPU fan spins and I can hear the HD turning but no video. I know on these motherboards that in order to use the on board video you would have to use a CPU that has that capability and the i3/530 is one of those CPU's. I wanted to just use the on board and not buy a card. This computer will be used only for office work. Any tips on what to try next to make this thing boot. I have not got any answers from ASUS on this. Thanks, Tom

Requirement listed on page 2-33 of mobo manual.

If it has the 8-pin connector on the motherboard then that's almost certainly what it needs. And the Core i3 does have rather hefty power requirements.

I used the "first" four pin slot last time I was in this boat....Different mobo and cpu but it worked.

I have been told today that unless you are going with a high end system like the i5 or i7 then the standard atx 4 pin will work fine. Steve I think maybe confirmed this. I just want to make sure. I am actually not the one building this PC but I was asking the question for the builder. He said a local PC shop said the power supply would work. They sold him the case and p/s. I know it is a cheap unit because Sam's club has the exact same case and power supply for $35. How do computer shops get away with selling something like this ? I have always been taught to never go cheap on a Power Supply. Oh well , maybe they will learn. Tom