I have been sifting through this thread for a few days and have tried several things to no avail.
I have a mid 2010 MacBook Pro. I was running Sierra with no issues until I tried to update to high Sierra.
The update was fine until it rebooted. I got the grey screen with the slash circle that would flash the Apple logo once in a while. Just in case I let it sit overnight which didn’t help.
I rebooted several time and got the same thing.
I then tried disk utility first aid and everything checked out except the the hard drive which says “the volume Macintosh HD could not be verified completely, file system check exit code is 8, updating boot support partitions for the volume as required, file system verify or repair failed, operation failed...”
Since the hard drive was fine before the update I am assuming the update corrupted the OS or some kind of boot sector.
So I tried restore in the disk utility, but it wants to erase the drive which is not an option, I need the data on the drive and don’t have a recent backup.
So I looked at the internet recovery, but when I go into that it does not give me an option to pick a wireless network it just goes directly into recovery. I also tried connecting directly to the router, but same result.
I did see on another site some info on using terminal to fix this, but it was not clear as to what they were doing and I don’t want to delete anything.
So can anyone help me to get any OS reinstalled without losing data? Or installing an OS onto a new HD so I can use the drive currently in the computer as an external drive so I can save my data.
I think I have covered everything, if not please be nice and ask. I am new here and just need a little help. Thanks