Just got a new motherboard put everything together and it wont boot, it just runs then shuts off

EA Kryptic

Honorable
Aug 13, 2013
13
0
10,510
Got a new Crosshair V formula Z motherboard, using 2 radeon hd 4850 gpu, and a vishara 4.0ghz 8 core processor, psu is 750w. I hook it all up and it starts then shuts off about 5 seconds later. Please help!
 

EA Kryptic

Honorable
Aug 13, 2013
13
0
10,510

Well it stays on now... But no image on my tv, gpu are connected and slotted properly