Mac Mini randomly stalling at bootup

Soldato
Joined
27 Oct 2011
Posts
4,221
Location
London
Afternoon all,

We have a Mac Mini in our of our classrooms (2012, 16gb RAM, 10.11.6) that all of a sudden is having these boot issues. Cue Tuesday where I'm sitting there with a tutor having login issues. I restart it and we're waiting a good 10 minutes just watching it sit there at the progress bar, almost stuck. I cold reboot and follow the same procedure twice and the outcome is the same.

AV technician pulls it out for me and hands it over in the office the next day. I do the following

  • Reset SMC/PRAM/NVRAM etc
  • Run a disk check in recovery mode. No faults, comes clean.
  • Run fsck -fy in single user mode. All good.

I then decide to do 10 bootups, time them and see what occurs. The first 8 attempts are successful and it gets to the login screen in under 2 minutes. However on the 9th I get the issue come back again and it's stuck; I leave it for 10 minutes before cold rebooting, doing a final boot and it's successful and under 2 minutes.

It does seem bizarre, but is there anything else I can do to try and find out why on Earth it's doing this intermittently?

Many thanks!
 
If you boot in verbose mode where does it stop?
You can boot into Mac OS X verbose mode just once, meaning on that specific boot, by holding down Command+V immediately after powering on a Mac (or immediately after reboot) – start holding down Command+V as soon as you hear the boot chime. You will need to disable any firmware password first.

As it's not your own money, you may as well just fit a 2.5"SSD to see if that fixes it (due to dodgy HD)
 
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