I have a new corsair cx430w power supply and an asrock fm2a75m pro4+. The 20+4 pin power cable on the power supply won't plug in all the way to the motherboard. I tried attaching only the 20 pin part and it still only goes about halfway in. Does not 'click' into place. After hours of trying to get this to work i've made no progress and think i'm just going to damage the motherboard. Is my power cable faulty?