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Why can't I install High Sierra OS Solved

Problem started when my computer began to slow—90% of CPU was being taken up by system processes. I reset the SMC, but that did nothing. I rebooted the system in safe mode, suspecting a third party kernal extension, but the slowness and high fan persisted in safe mode. I don’t have the skills to mess with Apple’s kernal extensions, so I decided to do a new OS installation.

I backed up my files, then attempted a High Sierra install from a bootable USB. The process went fine at first, but hung up on the apple logo screen with the progress bar at what looked like 99-100%. Tried multiple times, always hung up at the same spot on this progress bar. I erased the hard drive and tried to install again. Same issue. I tried to do an internet reboot to Mountain Lion, but no disk appeared to select to boot to.

I’m strongly suspecting hardware, but am not sure if it would be the logic board, or something else. I don’t know how to test this. Any info on how I can figure out the issue is greatly appreciated!

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Do a SMC reset? This resolved it for me.

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Hi Caitlin Dwyer

consider running Apple Diagnostic test to check for any possible issues.

https://support.apple.com/en-us/HT202731

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@salmonjapan Thanks for that advice! I ran the Apple Diagnostic test and it came back with a hardware error regarding the heat sensor. Looked into whether or not you can replace the heat sensor, and it turns out you can't because it's on the logic board. So I sent my logic board out to get repaired. Just got an email back today that the issue was fixed.

Thanks again

@caitm you are welcome, glad that the problem has been resolved

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the same thing happened to me while installing high sierra on my 2010 macbook pro, the slowness and high fan speed is indicating that one of the temperature sensors inside you macbook air have gone bad and is reading an incorrect temperature. this makes the system thermal throttle, which makes the fans go full speed, and makes the kernel task go high. if you leave the high sierra installer on for about 2-3 days it will finally finish. once it finishes, you can either install macs fan control, and see which sensor is bad and replace it. or you can delete the MacBookAir6,1 file which will completely disable the kernel task but you will have to use macs fan control to slow the fan down to speed. here is a tutorial on how to delete the MacBoookAir6,1 file

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If the sensor is bad your system will run in Safe mode which is a very reduced clock as the system is missing the sensor. MacsFanControl or any other fan control app won't help you hear.

on my macbook pro all of my sensors are reading correctly and the fans are at full blast and the clock speed is slowed. is this a logic board issue

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