Maximum PC

I just put together my new build and i am having troubles. when i boot up i get no beeps or anything. i get an a2 debug code then changes to a6. When i have my Graphics card plugged in i get no picture, however when i use onboard graphics it gives me picture and everything. so far the things i have tried is

-trying the 2 different pci-e slots.
-tried the 2 plug ins to the video card
-different power cables(with each one the video card fan is running)
-different monitor(still no picture)
-reseating the video card
-blowing out the pci-e slots
-reinstalled windows(didnt format before putting everything together)
-reseating the ram
-ran it with only 1 stick of ram

the only thing i am hesitant of trying is clearing cmos because i dont know really when to hit that tiny little button

SPECS:
ocz 600w psu
Intel 2400k i5
ASrock z77 extreme 4
nvidia GTX560
250gig HD
G-skill 2x4g 1600

please help!

thank you
-Ryan