So my friend purchased a 500gb 860 Evo and I installed it today. He has a Corsair CXM 550W. I used a, never before used, sata power cable, plugged into one of the open 6pin slots on the psu. The PC would not power on after this. I unplugged the cable, leaving the hdd hooked up, and it powered up no problem. I ended up having to unplug the power from the hdd and hook it up to the ssd. Booted up fine, installed windows, etc. Tried using the problem cable on the hdd, pc wouldn't power up. So I think it's either a bad cable, which is odd because I have never used it before. Or the psu cant supply enough wattage? Which would also be odd because it should be enough to power the whole build. Any ideas? Thank you.