Supervisor fabiosun Posted 2 hours ago Author Supervisor Share Posted 2 hours ago 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 1 Link to comment Share on other sites More sharing options...
khile Posted 1 hour ago Share Posted 1 hour ago (edited) 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 1 hour ago by khile Link to comment Share on other sites More sharing options...
Supervisor fabiosun Posted 1 hour ago Author Supervisor Share Posted 1 hour ago 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 1 Link to comment Share on other sites More sharing options...
Supervisor fabiosun Posted 1 hour ago Author Supervisor Share Posted 1 hour ago 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 1 Link to comment Share on other sites More sharing options...
Supervisor fabiosun Posted 1 hour ago Author Supervisor Share Posted 1 hour ago 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 1 Link to comment Share on other sites More sharing options...
khile Posted 1 hour ago Share Posted 1 hour ago (edited) 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 1 hour ago by khile Link to comment Share on other sites More sharing options...
Supervisor fabiosun Posted 52 minutes ago Author Supervisor Share Posted 52 minutes ago (edited) 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 51 minutes ago by fabiosun grammar and added last line 1 Link to comment Share on other sites More sharing options...
khile Posted 48 minutes ago Share Posted 48 minutes ago 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 Link to comment Share on other sites More sharing options...
Supervisor fabiosun Posted 44 minutes ago Author Supervisor Share Posted 44 minutes ago 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? 1 Link to comment Share on other sites More sharing options...
khile Posted 18 minutes ago Share Posted 18 minutes ago 23 minutes ago, fabiosun said: 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? Okay, so removed 4090 and put RX 6600 in slot one. It displays the bootloader and then a black screen, as i have an LG tv it shows its receiving a 1080p signal but i dont see verbose or anything Link to comment Share on other sites More sharing options...
Supervisor fabiosun Posted 4 minutes ago Author Supervisor Share Posted 4 minutes ago 12 minutes ago, khile said: 1080p signal but i dont see verbose or anything have you tried with differe GPU output ports? which model of GPU? it is weird and i am loosing hope because i have no others ideas Link to comment Share on other sites More sharing options...
khile Posted 1 minute ago Share Posted 1 minute ago 3 minutes ago, fabiosun said: have you tried with differe GPU output ports? which model of GPU? it is weird and i am loosing hope because i have no others ideas hi yes i have tried all ports on the card and its this card i have https://www.techpowerup.com/gpu-specs/radeon-rx-6600.c3696 Link to comment Share on other sites More sharing options...
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