I'm getting the folder with a?
I too have this issue on a mid 2012 unibody MBP.
It was running a Samsung SSD, flawlessly for years (purchased 2016), then it crashed one day last week and wouldn’t start. I got the folder with a ? in it and went through an internet recovery, whereupon, after downloading the OS, the machine restarted to the prohibitory symbol.
I installed a brand new Samsung SSD, formatted it to journaled in disk utility and then downloaded the OS again, assuming the 8 year old previous SSD (which I had used in previous iterations of MBP) had developed a fault. Same thing happened - it restarted to the prohibitory symbol.
Perhaps tellingly, the original SSD, when placed in a caddy enabled the Mac to start up as normal through a USB cable.
I therefore suspect the issue is a SATA cable failure, as you imply can be a cause.
What’s your view based on this description?
Bu iyi bir soru mu?