Hi, I have a Asus gtx 760 gpu and I'm looking for a psu that will be able to power it. Please help

I have brought an g7 power extreme 780 watts however when I luanch my computer it doesn't display any video and beeps 2 twice with a 4 second cap between each beep. Could this be because the psu doesn't have a atx12v 4 pin connector
 


You don't have a 4pin put in the cpu power connector? That would make the pc not powering up.

It has a 4pin,it probably has a 8pin that you need to break into two 4pins,after that you put one half in.

 


My computer powers up as I am currently using it with the inbuilt gpu. And I connect my gpu by using 2 6 pin pcie connector which connect to a 8 pin connector which goes straight into the gpu to power it.

 

That doesn't make sence.Your gpu needs two times a 6pin peg=powerconnector put in.What has the 8pin to do with it?
So take the two 6pin pcie powerconnectors and put those into you gpu.
 


http://www.ixbt.com/video3/images/gk104-5/asus-gtx680-complect.jpg

as you can see in that image there is a spillter cable that plugs into my gpu and 2 6 pin pci-e connecter connect into it.