Anyway, I did find a way to boot it up without the Radeon GPU:
- Boot in single user mode (cmd+s on startup)
- Enable read/write on the boot volume by typing "/sbin/mount -w"
- Create a directory to store the extensions files - "mkdir /DisabledExtensions"
- Navigate to the extensions directory - "cd /System/Library/Extensions"
- Move all ATI/AMD extensions to the directory previously created - "mv ATI* /DisabledExtensions" - "mv AMD* /DisabledExtensions"
- Finally, type reboot
When exactly do I hold down command + S? I've tried before the tone, after the tone, and before powering on, but after the grey screen with the apple logo everything still goes black due to my failed dGPU.
Help?