Setup Macbook Pro retina 13 A1502, SSD 128Gb Running Yosemite, but currently doing the update for high sierra.
Problem: Question marked folder appear after I left it for 2 days, battery run out (left it on sleep I think with minimal battery). It showed me a black screen I turned off&on again and folder with question marked appeared. I tried to reinstall using recovery tools, doesn't even show a selectable disk. Tried to Verify and Repair, nothing.
I created a bootable external OS X, from which I'm asking this, and I partitioned the SSD into 1.
Curious thing: OS X was in a different partition from the ssd.
Another curious thing is that the sdd disappears after I try something.
At some point I think it was in the hardware diagnose I found a error that pointed that EFI was broken.
sudo gpt -r show disk0s2
and this showed
start size index contents 0 236568496
The disks images I have
(the Apple SSD long name)
(External disk long name)
disk1 (renamed by me trying to follow a solution)
OS X Base System
The result of the disk verifying tool
"The Partition Map needs to be repaired because there is a problem with the EFI system partition's file system"
The Hardware diagnostic result
Reference code vdh002
sudo gdisk /dev/disk0s2
GPT fdisk (gdisk) version 1.0.4 Partition table scan: MBR: not present BSD: not present APM: not present
I guess I need to rebuild the EFI? What do I need to do?