After trying to install El Capitan and getting several notices that it can't be installed, now when I boot the computer it seems to be stuck in a login loop or something.

Every time I restart the computer now I see the grey progress bar start as though it's doing something (with Apple logo), it goes for a bit and then shuts the machine off.

I have tried holding Shift while powering on into safe mode, but it has no effect. I cant even boot now, just a loop.

I have also tried using Cmd+R to reinstall OSX 10.8.5 but it says the disk is locked. I chose reboot from 10.8.5 disk, but it simply goes back to the loading progress bar loop.

Was upgrading from 10.8.5. OSX on Intel MacBook Pro


You'll want to use the erase and install steps from:

Hopefully it's not a hardware error and you can just fix this with a clean erase.

  • i have to erase my hard due to a simple Apple update? How does this even happen? – Kalamalka Kid May 25 '16 at 9:33
  • It depends on the specific error of the notice when your install failed. If nothing ever failed, we wouldn't make backups or need to troubleshoot anything, no? – bmike May 25 '16 at 9:36
  • im curious how a perfectly working machine went to having a failed disk from a simple update/ – Kalamalka Kid May 25 '16 at 9:37
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    In my experience Its almost always the other way around - failed disks or corrupt data ruin simple updates. You can't know unless you analyze the system carefully and then repeat / isolate the failure. – bmike May 25 '16 at 9:41
  • That makes sense. I tried to reinstall OSX from Recovery mode after formatting the drive (didnt work because i didn't do journaled format, so im waiting for that to finish before i try again), but.. the system by default was trying to install 10.7. Is there a reason it automatically tried to install an older version of OSX instead of a more recent one from Recovery mode? I mean, the disk was blank.. – Kalamalka Kid May 25 '16 at 9:45

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