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From: Jolly Roger <jollyroger@pobox.com>
Newsgroups: comp.sys.mac.system
Subject: Re: A disastrous attempt to install El Capitan, please help
Date: 15 Oct 2015 16:12:51 GMT
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Juan I. Cahis <jicahis.SINBASURA@gmail.com> wrote:
> Dear friends:
> 
> Yesterday I tried to install El Capitan, and it was (and it is up to now) a
> disaster.
> 
> Previously, I did a Time Machine backup, and also I generated a pendrive
> with the El Capitan Installer.
> 
> I started the upgrade process from the Applications folder, the machine did
> the first reboot, the white Apple icon appeared, the horizontal thermometer
> started to work announcing me that 30 minutes were needed to finish this
> stage, and when only seven minutes were missing, the thermometer stopped to
> advance. I waited for seven hours, nothing happened, and after that period
> of time, I powered off the machine.
> 
> After some minutes, I powered on it again, a boot process started, the
> thermometer appeared again, and it showed the same position as before. I
> waited for another two hours and nothing happened again, so I needed to
> power off the machine.
> 
> The situation now is that when I try to start the machine, it tries to
> continue the failed install process, so I cannot go back or see my data
> there.
> 
> What can I do? Should I try to update the Operating System booting from the
> pendrive? Is this a safer methodology to be preferred to update Mac OSX?
> 
> Of course, although I have an up to date Time Machine Backup, I want to
> preserve the info stored on the hard drive.
> 
> The computer is a 15" MacBook Pro, late 2013, with 16GB memory and 1TB
> memory disk, with the last version of Yosemite installed, and before this
> mess, working without any problem.

I've heard of one or two people having this type of issue.

If it were me, I would boot from the USB stick, use Disk Utility to erase
the drive, install El Capitan fresh, and when prompted migrate the data
from the backup disk. Clean and simple.

Otherwise, you could try booting into Safe Mode, and installing from there,
which may or may not get around the issue.

-- 
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JR