Asus prime z 370 a issue

[j1mcrane]

Hi

 

So I have had a working hack for a while now

Asus prime z370 a

Radeon rx580

intel i9

Have had zero issues, but last night I did something daft, within the bios I changed the "igpu monitor" to "enabled"

Once I restarted I had nothing coming out of my Radeon rx580, only graphics from the onboard graphics and Mojave would not start.

Okay, no issue, I loaded back into the bios and swapped it back, also loaded the working bios config. Then when I started it still wouldn't work!!! 

This is where it gets weird, I reset the "cmos" on my motherboard, when I restarted the Radeon rx580 displayed graphics, but the system rebooted and switched back to internal graphics and Mojave will not load. It does this each time I do this!!

I'm pulling my hair out as I know the card is fine and it must be a bios thing, but have tried everything but cannot get the graphics card to start or Mojave as it just reboots.

One thing did work, I loaded the "optimised defaults" and all worked fine, but I then changed the board battery as I believed this was the issue, but no!!!

 

Anyone have any idea why??

 

IMG_0274.HEIC.zip

[j1mcrane]

So I managed to sort the issue. It seems that the Radeon card is not selected during startup if the onboard graphics have a hdmi cable attached. Removed the cable and reset the bios, left it a few minutes and voila!! 
two days of my life and a few handfuls of hair later success!!!

[MaLd0n]