I downloaded the update for High Sierra.
It then failed to update with a message saying to restart and press and hold D.
i pressed Restart and now i have no startup disk with the flashing question mark folder.
This is not a fusion drive. it is a macbook air 2012
MacBook Air, macOS High Sierra (10.13)
First, reset the NV/PRAM by holding Cmd + Option + P + R when powering it on. Allow the unit to chime twice then you can release the keys. Then immediately try booting into recovery mode by holding Cmd + R when you power the machine on.
Once you get to the recovery menu, try to reinstall the operating system. Resetting the NV/PRAM will clear out any temporary installers that are stuck in temporary memory, and hopefully you will be able to do a clean install.
Best of luck!
Ok thanks. That's the difference for me - nothing appears in the dropdown box for me, so it's not finding any hard disk. Have Boone a Genius Bar appointment.
James,
You need at least El Capitan or Sierra to upgrade to High Sierra, yes
Agree and sounds like a plan ~
I faced the same situation with my Macbook pro 2017. I solved my problem. These are the steps what I've gone through. 😐
The download file showed only 19 mb. If that is the case for you too, try upgrading to the latest Sierra first (10.12.6). Then download High Sierra again. It should be 4 gb+ download.
Hope it helps.
See this article How to choose a startup disk on your Mac - Apple Support
High Sierra install issues and now can't find startup disk
