stickman274 :
Thanks for all the input guys, managed to buy an old not working PSU and just took the cable from it
You might have a problem if you took the power cord from a cheap 250W PSU and are trying to use it with a 760W PSU. That's why I noted the wire gauges in the previous post.
With your machine running at full load, feel the cord. If it feels warm at all the wire inside the cord is smaller than what you need for your 760W PSU.