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macOS XP

macrumors member
Original poster
Sep 13, 2023
32
28
Hi everyone!

I have recently encountered an issue with my MacBook Pro Early 2015, which would sometimes not boot anymore, the progress bar stopping shortly after the beginning. When pressing cmd + v during startup, it stops the startup sequence at the message "Attempting system restart...MACH Reboot". I read about this error in some forums, but they seem to only occur on hackintoshes. Some time later it starts up and works fine.

What I have already done:
- The ssd is not at fault. It was replaced with an ssd which already had Catalina installed and worked perfectly for over a month in another MacBook Pro. Same issue after a few days again.

I would really appreciate any help. Thanks very much!
 

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HDFan

Contributor
Jun 30, 2007
6,777
2,974
The ssd is not at fault. It was replaced with an ssd which already had Catalina installed and worked perfectly for over a month in another MacBook Pro. Same issue after a few days again.

Did the system ever work properly after replacing the SSD?
 

macOS XP

macrumors member
Original poster
Sep 13, 2023
32
28
Yes, and it also did before with the old ssd. It is just sporadically having this issue. Also, once I wasn't able to log in after was in sleep. It just timed out and after a few days it startet up again. But when it is working, even heavy workloads are no problem, like exporting a project in iMovie.
 

macOS XP

macrumors member
Original poster
Sep 13, 2023
32
28
So I tried some things today, none of which solved the problem. I unplugged literally everything on the inside, except for the keyboard which is obviously necessary for turning the MacBook on, and even tried booting from a usb with Catalina installed, before and after removing the ssd. I also tried just running on the charger, with the battery disconnected, no success either. Resetting the NVRAM and SMC had no effect at all.

I really don't know what to do anymore, does anybody have suggestions?

I also attached a better photo of the POST messages.
 

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