New build. PC won't boot!

[LoganPS]

MOBO: MSI 970A-G46
CPU: AMD FX 6300
RAM: ADATA DDR3 1600 (2X2), GSKILL DDR3 1600 (2X2)
GPU: CROSSFIRED R9 270's
PSU: XION 700w ATX 12v
HDD: 750gb Seagate
SSD: 240gb Kingston

I have googled for hours and still have not come up with a solution. I upgraded my mobo/cpu/gpu and after hours of putting it together, it won't boot! I have done some trial and error and I have found that the fans only turn on when I *DON'T* have the ATX 8-pin cpu power cord plugged in. Is it a short in the MOBO? Surely my 700w PSU is enough? Please help!

 

[Havo_k]

A terrible psu is a terrible psu. Watts dont mean anything much if the quality of psu is piss poor.

 

[LoganPS]

A terrible psu is a terrible psu. Watts dont mean anything much if the quality of psu is piss poor.

So that's what you think my problem is? What would you recommend?

 

[Havo_k]

Either that or your mobo is damaged.

 

[LAsmokey]

I also have had this problem. If its not a quality psu then the Rails wont be worth anything. My KENTEK 950w couldnt even run my 7950. Got a Corsair 750w and it ran it find.

Get a Good Power Supply is the answer

 

[Calvin7]

Mixing memory kits can cause compatibility problems such as being unable to boot and unable to operate at rated specifications.