Asus p8p67 rev 3.0 turns off after 1 second

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Commendable
Aug 4, 2016
1
0
1,510
Hello guys!
Im having an issue with my new pc. I received all the parts today, i did plug in everythig and bam, the pc turns on for 1 sec, then it turns off and it starts to boot up again for 1 sec and do on. Mobo is asus p8p67 rev 3.0, i7 2600k, 2x4gb corsair balistix 1600 cl9, hd6950, 550w PSU XFX. I think the psu is fine as it worked flawlessly in my old pc (it was working fine today).
All the fans are spinning for 1 sec and then they go off.
There's 1 intresting thing that i,ve just noticed, when the cpu's 8pin is plugged off, the pc does not restart.
And ideas what may be causing this?
Cheers!