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alladyn21

macrumors newbie
Original poster
Oct 30, 2014
7
0
hello

I have a black screen after a power on my mac mini i tested clover botable usb and they brick my mac ... :( i cannot fix thix

Can i reflash efi?

What i check:
1) i cannot reset with (opt + command + p + r)
 
Last edited:

wol

macrumors regular
Jun 15, 2005
186
119
hello

I have a black screen after a power on my mac mini i tested clover botable usb and they brick my mac ... :( i cannot fix thix

Can i reflash efi?

What i check:
1) i cannot reset with (opt + command + p + r)
Could be similar to the problem reported in
https://forums.macrumors.com/threads/mac-mini-boot-only-windows-7.2019818/#post-24024807

Booting from an external MacOS(X) disk and using Disk Utility / First Aid might help. It seems that sometimes when a Mac is booted from Windows or Linux, some part of the MacOS(X) boot block gets altered, which then prevents booting from OSX.

Make sure you have a full backup of your hard disk before trying anything else. Then google "osx boot block gpt" to learn more about the boot block and GPT, and how it might be possible to fix it (in case the First Aid did not lead to the desired result).

Good luck!
 

alladyn21

macrumors newbie
Original poster
Oct 30, 2014
7
0
No first aid and i cannot bot to the windows but i "read about osx boot blockgp" for my mac is only black screen no sound, no usb, but when they run bt keyboard run to ....

Any comands is usleas
 

Kaida

macrumors 6502
May 28, 2016
338
136
Singapore
try a usb keyboard? i dont think a publicly available sw can cause anything to the apple efi?
 
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