H470M-HVS how to disable iGPU

hi , just got me a H470M-HVS motherboard , got it all set up windows 10 works fine , all drivers ect setup , i have no audio but most of all i have no option in bio advanced settings to disable onboard graphics , i used a gt710 nvidia and a gtx 1050ti both will not function right , main output is set to use the pci but both cards will either not show up or if i install drivers will show the error code 43 and say it stopped the drivers . any ideas on how to get me my gpu to work , the gt710 worked fine on my old mobo asrock and that was like an old ddr3 lol

Hope this help!