install high sierra macbook air circle line

It seems to have left behind a kext named .kext and once I deleted it, things work again. Before I knew this I installed Malwarebytes to check for spyware/adware causing the CPU usage, then uninstalled it after installing the OS X beta. I am using the Beta version because 10.13.2 had very high CPU usage by the WindowServer process that was fixed in 10.13.3. Update – I updated to 10.13.3 High Sierra Beta 5 and once again was unable to boot. Removed everything older than 2016 after running ls -lat. This time I had to remove kexts from /System/Library/Extensions. Update – I updated to 10.12.6 and once again was unable to boot.

Update – This has been an issue for myself and others running OS X Sierra as well. Update – It happened again when I updated to 10.11.4! Even fewer clues this time, additional details and an updated script to remove non-default kext files at the very bottom. Otherwise feel free to read the saga below! Let go of the keys and let your Mac reboot normally.If your OS X El Capitan/Sierra/High Sierra update won’t reboot you can skip to the fix or check here for the (mostly) automated fix script. Hold those keys down until your Mac reboots again and you here the startup chime. Press the power button and then press command-option-p-r. Yes, all the way down, not sleep or logging out. When it get stuck on the circle with a line through it on reboot, shut down the computer by holding down the power button. When you install the High Sierra upgrade, it will want to reboot (and this is where I kept running into that circle with a line through it on boot up). When I tried to install on blank HD from installer on external HD, I kept getting caught at the circle with a line through it error so I decided to do a clean install of Sierra and upgrade from that). Upgrade from MacOS Sierra (you may be able to skip this and install from High Sierra boot installer directly.

This is what finally worked for me after multiple different attempts to do a clean install:

Install high sierra macbook air circle line