Psu not working

Oct 11, 2018
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Bought a power supply because I thought my old one was going out, got a Corsair vs650, and now my pc won’t boot up. I put the old one back in and it boots right up. The motherboard is a 760gm-p23. Whats my issue? I made sure everything is connected with new one, and it didn’t work so I swapped to old one and it works so I know it’s not me plugging in stuff wrong. What’s the chances of me getting a faulty psu from Newegg?