I just buy a msi radeon rx580 video card...but when I hook it up with pci express cable it wont start...if I unp[lug the cable to the video card it will start...I have tried this rx580 in my other computer and it works so it cannot be the card..any help would be helpful...I have so many cables for other power supplys and maybe this cable even though it say pci express on it is maybe wrong cable..also I tried many more pci express cables that I have in my junk pile..