I replaced the hard disk with a SSD, including therma sensor, installed the OS and got it up the first time. But then I got a new problem, the flashing folder with a question mark kept popping up every now and then after a reboot or after it went to sleep (and never got back). Any ideas how to solve this?
Anyone faced the problem of the “Grey Blinking Question Mark Folder” after this upgrade? I followed all the steps:
- Tried to reset SMC and NVRAM
- Formatted the SSD using Disk Utility
- Tried to reinstall MacOS High Sierra from scratch via recovery mode
The problem usually comes when the computer goes to sleep, and never comes back alive. When I shut it down and start it up again, the blinking folder came back. Can’t seem to find any other solutions.