From reading several threads, I am sure the AMD GPU is failing on my 2011 MacBook Pro. I have seen the instructions to boot in safe mode and use commands to eventually turn off the AMD GPU and turn on the integrated Intel GPU. Here's what I did (using the AppleMacFinder procedure: https://bit.ly/2oDKvhP).
I booted with CMD + S and followed the 9 steps as described in the procedure. Unfortunately, I get stuck at step 5: sudo rm -rf /System/Library/Caches/com.apple.kext.caches/. When that command tries to remove the AMD drivers cache, I get 14 subdirectories listed with the error message "Operation not permitted". So I cannot continue with steps 6 till 9.
I think one of my issues is that SIP is enabled, and I cannot get it disabled. I need Terminal to use the command "CSRutil disable", but if I start in Recovery mode, my screen turns grey and the system shuts off before I reach the OSX Utilities interface. Also I wonder if the read/write access is in order, or that it sticks in read only at mounting.
What Can I do about this?
I booted with CMD + S and followed the 9 steps as described in the procedure. Unfortunately, I get stuck at step 5: sudo rm -rf /System/Library/Caches/com.apple.kext.caches/. When that command tries to remove the AMD drivers cache, I get 14 subdirectories listed with the error message "Operation not permitted". So I cannot continue with steps 6 till 9.
I think one of my issues is that SIP is enabled, and I cannot get it disabled. I need Terminal to use the command "CSRutil disable", but if I start in Recovery mode, my screen turns grey and the system shuts off before I reach the OSX Utilities interface. Also I wonder if the read/write access is in order, or that it sticks in read only at mounting.
What Can I do about this?