"A flashing question mark in a folder"に関する回答Ok this was weird, but as a last ditch option it worked. We put the Mac air that had an ssd drive into the freezer for 20 minutes. It booted we backed up the critical files .. and we moved on. The only way I would advise people to try this is if they tried everything else but the e waste recycle. In this case it worked .. and I will be the first to admit it was a last desperate throw of the dice!