Thunderbolt Display Blinks

Discussion in 'Mac Accessories' started by bdsmith63, Dec 30, 2014.

  1. bdsmith63 macrumors member


    Dec 19, 2009
    I have the latest 2014 Mac Pro running 2 Thunderbolt Displays. I have both displays connected directly to the Mac. Periodically, only one display with blink a black screen and return automatically. What could be the cause of this issue? I have previously had the display that was blinking connected to the first display, thinking maybe there was some issue with connectivity, but that appears to not be the case.

    Thanks for any advice,

  2. DeltaMac, Dec 30, 2014
    Last edited: Dec 30, 2014

    DeltaMac macrumors G3


    Jul 30, 2003
    Have you tried different buses?
    Apple recommends that displays be connected to different Thunderbolt buses, when possible.
    There's three buses, so you could try different combinations of ports.

    Is it always the same display that blinks?
    Could be a problem with the internal electronics/power supply.

    Take it to an Apple-authorized service shop for service/repair.
  3. bdsmith63 thread starter macrumors member


    Dec 19, 2009
    Yes, it is just the same display that is causing the problem. The display is less than a year old. I bought one display through the Apple store and the other through Best Buy. I am not sure, but I think the one with the issue is from Best Buy, can I just schedule an appointment at the Apple Store Genius Bar?

    Thanks, Brian
  4. 65535 macrumors member

    Jul 20, 2011
    Check your warranty status on Apple's service page, if you're within warranty get in touch with Apple. Also there was a firmware update not that long ago. I had to disconnect everything and install the update one display at a time but that did the trick. I've had no issues with my dual display Thunderbolts on my hexer stock Pro.
  5. bdsmith63 thread starter macrumors member


    Dec 19, 2009
    Thanks for the info. I'm going to do both with connections to different buses and run the updates. I am within 12 months of the purchase date, so if I have issues I should be able to take it back to Apple for repair or replacement.
  6. ZMacintosh macrumors 65816


    Nov 13, 2008
    was the Display from Best Buy sealed? could have been a DOA that was returned and best buy resold it. (farfetched, but curious none the less).
    But yes, Apple will take care of ALL products regardless of where purchased.

    Also if you run Apple software update do you see any firmware updates?

    That happened to a recent Thunderbolt Display, and after running the firmware it has not since persisted in flashing.
  7. bdsmith63 thread starter macrumors member


    Dec 19, 2009
    Well the interesting thing since your last post, was that the issue seemed to be resolved after switching connections and I can't remember if I had a firmware update or not. But I've noticed just this week that something has caused it to return again and blink. There were several OS X updates a week or so ago -- surely wouldn't think something like that is causing the issue?
  8. drambuie macrumors 6502a

    Feb 16, 2010
    This doesn't help your problem, but, if you Google "thunderbolt display blinking" you will find a history of this issue. It also occurred with the Cinema Displays.

Share This Page