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Problems with Thunderbolt display on boot up with Mac Mini?

830 Views 11 Replies Latest reply: Mar 22, 2014 8:15 AM by crobbo RSS
crobbo Calculating status...
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Oct 30, 2012 1:27 PM

I have a 6 month old Mac Mini and bought a Thunderbolt display.  All was good until about the time I upgraded to Mountain Lion.  Now I find that often when I boot up the screen remains black and the login screen never appears.  Sometimes the screen goes plain grey and stays that way.


I have to hold the power button on my Mini to force a shut down and then reboot it, which sometimes works.


I love this display, but I can't work out if it is the display, Mountain Lion or the Mac Mini that is the source of the problem.


Can anybody help?



  • Barbara Passman3 Level 2 Level 2 (180 points)

    very well may be USB

    Lots of other threads here and many of us have had weird problems all relating to devices plugged into th USB on the Thunderbolt Display and , I am now suspecting, many of our devices are not new.

    How old is your camera?  Older USB drivers may be the demons here

  • Barbara Passman3 Level 2 Level 2 (180 points)

    Glad I could corroborate your findings.

    I am still working with Apple Support to get better understanding of the USB issues with Thunderbolt

  • Yaworsky Level 1 Level 1 (0 points)

    I am having the exact same problem with a TBD and a macmini. I noticed the same thing crobbo did with the iPhone. Did you ever figure out what it was?

  • tbirdvet Level 3 Level 3 (970 points)

    Sounds like a bad (or poor connection) TB cable/plug.  My TB plug is a tight fit into my Mini and I need to push it in with some force to make a good connection.

  • Yaworsky Level 1 Level 1 (0 points)

    I agree. After playing around with it this morning I suspect that I am having connectivity issues. I noticed the thunderbolt cable is quite twisted/worn near the connector (this display was in storage for almost a year and I think it probably was resting on the cord). I may need to have it replaced I finally got it to work after "massaging" the cable. Thanks for the help.

  • Yaworsky Level 1 Level 1 (0 points)


    I went down and picked a thunderbolt cable and used that to connect my mini to my display. All of my problems have disappeared. Therefore I think my problem is probably the multi-cable. I am going to take it in to the apple store to get an esitmate for repair. You might want to give that a try.


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