kliptical

I have just completed my Egpu setup. I am using the PE4L-EC060A adapter. Everything is working except there are buzzing / electrical noises coming from my power supply. I have tested with 2 different power supplies and both have the same issue. When I test them in a desktop computer they do not make the noise. Trying to think of what I may have not hooked up right but not sure. I do not have the 2 pin dopunt cable connected, I am not sure what that cable is for. Any help would be greatly appreciated.