No Bootloader/ASUS Boot up screen when plugged into DisplayPort on Sapphire Rx580 pulse

i have the asus prime z370-a ii, and rx580 pulse and have successfully installed mac and windows into my pc but whenever i boot the machine from my gpu, the screen says something like theres no input, searching for one, until mac loads then there will be a screen. this means i wouldnt be able to boot into my windows as well when im on my gpu. everything works fine when im booting w my igpu. what shd i do..

submitted by /u/doyknowwhatimsayin
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