just did a direct upgrade and having this same issue! multibeast doesn't even see the main drive, and clover install fails ... more research is needed :)
I have been battling this since beta - the installer never loads -- IT DOEDS if I use IGPU and have second monitor connected to raedon r9 280x, but shows only 512 MB of video ram.
I have the raedon r9 280x as well, and can't get to the installer - it did book with IGPU enabled in bios, but then with inject intel, I only get 512 MB of video ram :(
that is what I had to do -- with both on I have dvi from motherboard to a monitor, then another monitor to the AMD card -- but as I say I am only seeing 512MB of ram in the about this mac section. my derp moment -- I am just trying to figure out what the change was from 10.12.6 to 10.13 -- frame...
I'm having the same issue. r9 280x - I use dual DVI - and can't boot to the installer unless I set to uiGPU - which is intel 3000 and I only get 512MB of video ram.
I just can't get past a black screen. maybe I am not waiting long enough? DMOS arrives , after some sound assertion errors, but then no matter what I try, just a black screen. I can see the monitors have not gone to sleep... was reading your method bald, about creating an installer and...
Thank you! Was wondering what was causing the restart - going to remove synapse here now and see if that helps. I also noticed a high CPU usage on my system and looks like it was spotlight - I disabled spotlight with terminal "
sudo mdutil -a -i on"
and then removed the caches with " sudo rm -rf...
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