So I have a Asus z87 pro motherboard and I have been using the gtx 780 ti with it for my main monitor and the integrated graphics for my other 2 monitors and it worked great but after I got the GTX 980 the integrated graphics don't work even when I have igpu activated on the mother like I did for the 780 ti but it won't boot into windows and just stays in a never ending Asus logo telling me to go back to the bios but when I turn off igpu my computer boots up but only my main monitor shows up so nothings wrong with the GPU so do you guys know what is going on? Why can't I use integrated graphics after I upgraded my gpu