Chosen Solution
Flashing folder whenever startup Mac, I’m not sure what to do I opened up my Mac and couldn’t find the hard drive
Sadly your drive (SSD) has lost its system. You might be able to recover by re-installing the OS, if that fails then your logic board will need to be replaced as the drive is soldered to the logic board and not replaceable. Restart your system and press and hold the keys Command (⌘) and R to get to OS recovery either via your drive (hidden partition) or from the internet. Reference : Mac startup key combinations
I had that same problem… it wasn’t the hdd (in my case ssd), it was the sata cable. https://www.amazon.com/MMOBIEL-Replaceme… After the installation everything worked as always
