Faulty Motherboard or PSU????

[Hans-Landa83]

Hi guys I need some advise please, I just finished my new build and I go to power on my system everything lights up the cpu fan spins as do the fans on the graphics cards but there's nothing happening on the monitor no output what so ever. Now one thing I have noticed when going through the usual rigmarole of taking different RAM sticks out and putting the graphics cards in different lanes is that every time a go to power on the system it switches on then immediately powers down, I then have to hit the power button again to get it going, I'm thinking the psu isn't right?

specs are

cpu- 3930k
2x sapphire hd 7970
Asus Rampage IV Extreme Intel X79
G.Skill RipJawsZ 32GB
Corsair Professional Series AX1200

 

[Hans-Landa83]

Cheers for the feed back guys, Im still struggling away to try and resolve this but might have had a small break through of some sort, I cleared the cmos then powered on and the screen came up with the bios so I thought great changed a few setting then hit the reset button thinking I will be loading windows any minute then the pc powers up and boom no signal to the monitor again. I cleared cmos again went into bios my graphics card is there as is my one stick on 4gb ram all the voltages are in order reset and again no signal....Doh.......

 

[Hans-Landa83]

Right i'm 95% certain its a psu issue, i have tried both of my 7970's now and neither are giving me any output to my monitor even though the fans are spinning on the card, I have tried three different cables HDMI DVI AND VGA with no success, can safely assume it aint the graphics cards. When I go to press power on the mobo it powers on few like three seconds then turns off so I have to press it again, the psu just doesn't sound stable to me.... Might have to RMA this.....