Chosen Solution
I have a A1502 I bought 2nd hand. It has been working find for about a year. Then it booted up one day and showed the flashing folder with ? that indicates it cannot connect to the ssd. I start up in recovery mode, and ssd is not seen in disk utility, or in startup disk. I can boot from an external drive (USB) or target disk (thunderbolt), so it seems the logic board is working fine. I have not upgraded to High Sierra. I get a rental drive Apple SSD from OWC to instal so that I can upgrade to High Sierra to upgrade firmware. I instal the rental Apple SSD, and laptop does not find that SSD either. I put the rental Apple SSD in OWC enclosure, and it can connect to it via USB. Does this mean there is a connection issue from the SSD to the logic board? If so, it there a way to address just the connection without replacing the whole logic board? A new logic board (plus the new OWC drive I have already bought) would be more than I paid for the laptop second hand. Any help or insight would be appreciated. Thanks, Will
Either the file system has failed, and needs reinstalled or Alternatively, the Solid State Drive has failed.
