Help regarding ASUS motherboard

So I've been trying to install Mojave on my system, I got to the install and everything went fine, however I can't seem to boot into any other os besides windows. I've even tried Linux and can't boot into it. So apparently I'm missing something in the bios even after following the guide.

My system is as follows:

i7 4790k

16GB DDR3

ASUS Z97-AR Motherboard

AMD RX480 8GB

Any help would be appreciated, I'm installing OS X to a separate drive from my windows install, not looking to try and manage two boot drives I can manually load my OS X drive when I want to use it.

submitted by /u/blueangel1953
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