A checklist to do: http://www.tomshardware.co.uk/forum/261145-31-perform-steps-posting-post-boot-video-problems
Btw, your Corsair CX series PSU is low quality (Tier four) PSU.
Built down to a low price. Not exactly the most stable units ever created. Very basic safety circuitry or even thin gauge wiring used. Not for gaming rigs or overclocking systems of any kind. Avoid unless your budget dictates your choice.
PSU Tier list: http://www.tomshardware.co.uk/forum/id-2547993/psu-tier-list.html
I suggest that you get yourself a good quality (Tier two) PSU, preferably great quality (Tier one) PSU if you could afford it.
Anything from Seasonic is great, e.g Seasonic G-550.
But before going for new PSU, do every step in the checklist.