x870e motherboard ASUS ProArt X870E-CREATOR WIFI - Ryzen 9950x

[fabiosun]

Do you mean also no video input of your bios scanning?

or do you see opencore bootloader?

you must start from your USB pen or disk and you have to format it in a proper way for EFI

[khile]

1 hour ago, fabiosun said:

Do you mean also no video input of your bios scanning?

or do you see opencore bootloader?

you must start from your USB pen or disk and you have to format it in a proper way for EFI

 

So on the 4090 i see the bios and press F4 to boot from UEFI USB, and i see the bootloader showing Mac (usb drive) and my Windows installation. I then select Mac and both monitors go black i have left it for an hour while i did a few errands, and when I came back still the same black screens 

I formatted the USB as FAT32 and GPT using Rufus, like the below screenshot

 

see below video

 both gpu plugged into tv as other monitor was borrowed and needed to be returned (4090 on HDMI 4) (6600 on HDMI1)

Edited 56 minutes ago by khile

[fabiosun]

6 minutes ago, khile said:

So on the 4090 i see the bios and press F4 to boot from UEFI USB, and i see the bootloader showing Mac (usb drive) and my Windows installation. I then select Mac and both monitors go black i have left it for an hour while i did a few errands, and when I came back still the same black screens 

it could be normal if you use 4090

try to connect your monitor(s) to rx6600

you should also prvide a full installer and not a recovery installer because in tahoe your ethernet card could not work and a recovery installers needs a working one ethernet

[fabiosun]

then with my efi you should see a "dos" verbose scrolling lines

Boot menu i see there is from gtx 4090?

We should see it on RX 6600

usb pen seems to be formatted well

[fabiosun]

bios settings are well done for OSX?

usually is possible to load default settings, disabling secure boot keys and fast boot, also to set CSM off and UEFI on, 4G on should be enough for many setups

[khile]

12 minutes ago, fabiosun said:

then with my efi you should see a "dos" verbose scrolling lines

Boot menu i see there is from gtx 4090?

We should see it on RX 6600

usb pen seems to be formatted well

Yes the boot menu is on the 4090. The 6600 does not display anything, but when I click mac it will briefly flash like it's getting a signal then just stay black 

i cant seem to find a full installer that will give me a dmg image they all download as pkg files 

Edited 40 minutes ago by khile

[fabiosun]

12 minutes ago, khile said:

Yes the boot menu is on the 4090.

is it watercooled or you can remove easily it?

because it is weird if your RX is working well in other os

can you connect only a monitor to RX 6600 and try to boot to your USB as i see in your video?

then will think to full installer problem 🙂

I have a doubt if it is a problem with installed 4090

 

21 minutes ago, fabiosun said:

bios settings are well done for OSX?

 

Edited 27 minutes ago by fabiosun
grammar and added last line

[khile]

Just now, fabiosun said:

is it watercooled or you can remove easily it?

because it is weird if your RX is working well in other os

can you attacch only a monitor to RX 6600 and try to boot to your USB as i see in your video?

then will think to full installer problem 🙂

 

 It is water-cooled but i have just removed it from slot and disconnected power to it (4090) so only RX6600 is in the system i see the bootloader and then when i select Mac it shows a black screen i dont get and verbose or anything  I have also reset bios and changed setting as stated above and still same issue 

[fabiosun]

I know i am asking so much 🙂

could you put Rx 6600 in first slot?

are you sure you are trying from my latest EFI?

it seems you loose hdmi connection or there is always a signal also with black screen?