Unable to install macOS, what could be wrong?
Trying to reuse my old iMac 27” and install high sierra from a bootable media, but got this error message, see attached picture. What I tried:
- Use the same booting media to do the installation on an external hard drive from another working iMac. Successfully installed.
- Then Connect this external hard drive back to this “issued” iMac, and select it as booting drive. It booted successfully, no problem at all.
- The internal hard drive from this “issued” iMac passed hardware test though, so, the issue is not the internal hard drive though.
Any ideas what could be wrong here?
Thanks,