I know that you can disable the part of a 4770K cpu to not do GPU functions, but I really cant help you with your problem, but on page
1-32 of our manual they talk about a Q LED light that if the VGA card has a problem, it will light up.
Also check system info on page 4-35.
Im very new to my MB and ram and cpu, so Im sorry I could not be of more help.
Good Luck