Pc keeps turning on and off

I bought a new Antec NeoECO 620 WATT to replace an old 180 WATT i had before. The new one was working for idk a while then i was unstalling a program; lenova drivers & application installation and after that it rebooted then it would turn on and shut off and on every 3 seconds. My pc works fine if I put back the old 180 watt i had before. Later I tried again with the 620 watt and it worked for a min or two and started doing it again off and on. I've tried the paper clip trick and the fan powers on and spins fine. Any thoughts?

My specs
Inte(R) Pentium(R) CPU G2020 @ 2.90GHz
Ram 4gb
Intel HD Graphics
Antic NeoECO 620 Watt 80 PLUS Bronze
Windows 8.1
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  1. Best answer
    Sounds like it's going bad. I dont know what magic the paper clip trick works though.
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