So I bought a cx600m on ebay used from this guy that seems reputable, 1500 positive, 12 neutral and 4 negative and only one negative said that the power supply broke. So I was just using my computer when it suddenly turned off, I tried pressing the power button and it did nothing at all, then I tried shorting out the power on pins on the motherboard to try turning the computer on and it didn't start either. There is a green light on the motherboard near the bottom right so I'm not sure what exactly is broken. I have checked all of the connections and they all plugged in correctly. Edit: I am using a 2500k and r9 280x, both are not being overclocked so 600 is well enough.