Try using /sbin/mount if you get mount command not found Once done mount the MacBook Pro hard drive by adding. Now in the terminal add the following, which will fix any disk permissions before we do anything. On reboot go back into single user mode by holding down the CMD + S keys. When csrutil is disabled we can now move kexts and delete system folders. On the screen that loads choose a language then on the screen which appears next choose the following options in the menu Utilities -> Terminal - see below. Now reboot into Recovery mode using CMD + R. The terminal will now be on the screen.įirst input. So first reboot your Macbook Pro into single user mode by holding down the CMD + S keys. But I had two problems - I had no permissions when trying to disable the csrutil and when trying the same with Recovery Mode - CMD + R I had the blue lines on black screen appearing, but the below sorted it for me. Now there are other solutions that say at first boot into Recovery Single User Mode - CMD + R + S. The solution is to change your energy settings and make sure the screen saver animation options are always active. NOTE: One known issue to this solution (and maybe others) is that when the screen goes to sleep/black it no longer wakes up, therefore needing a forced reboot.

Now there are several solutions on the web but this is the only one that worked for me running macOS High Sierra (10.13.6+) and what was worst for me is that the MacBook Pro was stuck in looping reboot. If you are suffering from the infamous blue lines on the black screen on startup or random reboots then you maybe suffering from an AMD graphics card hardware issue with your later 2011 Macbook Pro laptop.

Macbook pro 2011 graphics card problem