Contribute
Register

Attempting System Restart ... Mach Reboot

Joined
Sep 2, 2017
Messages
15
Motherboard
Gigabyte GA-H270-HD3
CPU
i5-7500
Graphics
GTX 1060
I somehow broke my setup after upgrading my system from Sierra to High Sierra.
The update itself worked fine, but during post installation trying to get my external HD recognized and to get audio to work, after installing the kexts for audio and running Multibeast for the USB ports, my system refuses to boot.

It hangs at
Attempting System Restart ... MACH Reboot

I am unsure how to extract any files from my EFI partition since I can't boot. Any help is appreciated.
 

UtterDisbelief

Moderator
Joined
Feb 13, 2012
Messages
2,157
Motherboard
Gigabyte Z370M D3H
CPU
i3-8350K
Graphics
RX 560
Mac
iMac, Mac mini
Classic Mac
eMac, iBook
Mobile Phone
iOS
I somehow broke my setup after upgrading my system from Sierra to High Sierra.
The update itself worked fine, but during post installation trying to get my external HD recognized and to get audio to work, after installing the kexts for audio and running Multibeast for the USB ports, my system refuses to boot.

It hangs at
Attempting System Restart ... MACH Reboot

I am unsure how to extract any files from my EFI partition since I can't boot. Any help is appreciated.
Use your UniBeast USB drive to boot the system. Doesn't matter if it is Sierra.

Suggestions:

1) Use disk util on the UniBeast installer to check the main drive.

2) If you can boot using UniBeast, using Terminal you can copy the EFI folder from your USB drive to the main one to get your system up and running (backup the one already there by renaming etc).

3) If you can't boot with UniBeast you should still be able to access the EFI partition and folder on the main drive using Terminal again, although it is a bit arcane. You first have to mount the partition etc.

4) If you kept your High Sierra install as HFS+ format you could possibly access the errant drive using Windows or Linux and a file system access utility on another drive etc.

:)
 
Top