Two iMacs does not start after the 10.11.4 update.

Two iMacs does not start after the 10.11.4 update.  Progress bar starts moving and then text appears on the black screen saying unexpected sigkill to launchd.  He then gets stuck in a loop trying to start.  Tried to reset the SMC and LANDAU.  Without success.  Started in recovery mode and ran disk utility.  Discs said OK.  Chose to reinstall OS X from the list of options in the recovery mode (assuming it would be 10.11.4).)  Installation is finished but still once does not start.  Reinstalled on 10.11.0 successfully from a USB key and downloaded the 10.11.4 combo updater.  Installation seems to work, but once again, the macs will not start.  Same 'unexpected launchd sigkill' error.  A mac is now back working properly with 10.11.3 the other will be shortly.  Is there a problem with the accession?  Our COMPUTER support use Munki to get updates from one day to the next.  Fortunately, we were able to stop it before the other 20 or if Mac had the same problem.

More information: two bricks iMacs were late 2013 models.  A 21 "and a 27.  We have just updated a test iMac which was a late model 2012 using the 10.11.4 combo updater.

Tags: Mac OS & System Software

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