I'm experiencing a shutdown of an iMac during startup, when the progression bar almost halfway.
I tried, with no success: - starting up from the iMac recovery partition and checking the HD with Disk Utility (rebuilt permission, verified the HD) - Safe Boot - Fsck
Before attempting to reinstall Mac OS I think I need to backup the iMac first.
Any other check suggested before trying to re-install Mac OS?
Thanks for any insight!