New PC Build turns on for 10s then turns off and repeats. no display

[Kenjisak]

Specs
mobo : ga-h110m-a
cpu: i5 6600 3.3ghz
ram: corsair vengeance lpx 2x4gb 2800mhz
gpu:amd hd 6990 4gb
psu:cx750m

tested psu and gpu on my old rig and they are working perfectly. once i boot up the pc all the fans and led turn on of 10s then turns off and it keeps repeating. no beep when turned on.

 

[alexoiu]

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