Computer turns on for half a second then turns off with new PSU

Hi, I made a new build about 2 months ago but recently my seasonic X-850w PSU died so I bought a Corsair RM850, my problem is that it will only power my computer for a split second, everything will turn on and spin for that second but instantly turn off. When i turn on the Corsair PSU my motherboard led lights turn on and stay on put when i press the power button all the lights turn off. I tested my pc parts with an old XION 700w PSU and everything turned on fine. Could it be my bad luck and got a DOA psu?

Hardware specs
Case: Cooler master HAF X
CPU: Intel i7 4770k
RAM: G.skill ripjaw X DDR3 1600
SSD: Samsung evo 840 750GB
CPU Cooler: Corsair H100i
GPU: Nvidia EVGA GTX 780 Classified
Motherboard: Asus maximus vi hero
Windows 7 home premium
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  1. Best answer
    if your system is working with other PSU as you said and if you plugged all connectors properly (on the PSU) so PSU gone bad
  2. Yeah, the PSU is prob bad.
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