Need help my motherboards both instantly shorted

[BigMac1256]

I built this PC http://pcpartpicker.com/user/BigMac1256/saved/G6X6Mp
And I finally put it together but after about I shut it off it wouldn't turn back on so I tested it and found a dead motherboard sent it in got a new one same thing happened the only things I can think of that happened is not enough power and/or not compatible

 

[Someone Somewhere]

http://www.tomshardware.com/forum/261145-31-perform-steps-posting-post-boot-video-problems

At a guess, you don't have the correct standoffs installed or have too many.