I'm having the following problems:

  • after latest El Capitan update, my Macbook Pro (mid 2010) crashes (turns off) during boot.
  • I'm unable to boot in safe mode, the only way is recovery mode.
  • I've ran disk utility with ok results.
  • I've done PRAM reset with no effect.
  • I'm trying to reinstall El Capitan as a last resort but I'm getting the following error message: "An error occured while preparing the installation. Try running this application again."

Currently I'm really stuck in the middle of nowhere, everything I've tried goes terribly wrong and I have no clue what is going on.

Please help,


1 Answer 1


There most common cause for this error, is a time/date issue.

If you notice the time and date are wrong during the installation, try the following:


There's more info on the error here: http://osxdaily.com/2015/01/19/fix-os-x-install-errors-cant-be-verified-error-occurred-preparing-mac/

  • I have already tried fixing time/date in Terminal, but it won't do the trick in my case...
    – bogdan38
    Commented Jan 3, 2016 at 22:44
  • Are you using a third-party SSD? And is TRIM enabled? Some suggest to turn it off while installing/restoring.
    – malik
    Commented Jan 6, 2016 at 20:34

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