problems with my MacBook Air
So the other day, I decided to erase my disc because I had this drives on there that didn't belong to me and when I erased the disc, I got the folder with the? In the middle that's blinking. Can someone please help?
Question marked as
If your Mac starts up to a question mark - Apple Support
The Mac can't see a proper OS on any drive. You'll need to reinstall macOS.
Guidance is in the link.