Same issue, but with a MacBook Pro Early 2011.
Here's what I did to fix this: I first attempted to boot in Internet Recovery (Option + Command + R at startup). That didn't even work for me. So, using a separate Mac, I made a bootable USB Drive. Creare una chiavetta USB avviabile The Mac was able to at least boot at that point.
After I formatted the SSD, I reinstalled macOS using APFS. And yes, by the time macOS installed and I got back into the desktop, IT WAS SLOW!!!!! Like, way slower than with the Hard Disk (HDD) Drive.
After spending many, many hours on the internet looking for a solution, here's what I found: You need to activate TRIM Support. After loading into the Desktop, open Terminal, and type sudo TrimForce Enable
. You will need to type Y several times, and then eventually the Mac will Reboot. After that, the Mac should be running just fine.
To make sure TRIM support is enabled, go to the Apple Menu > (While Holding Option) System Information... > SATA > TRIM Support. If it says "Yes," you're good to go. If it says "No," punch in the command one more time.
Hope this helps, best of luck!
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