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bdsmith63

macrumors regular
Original poster
Dec 19, 2009
100
17
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,

Brian
 

DeltaMac

macrumors G5
Jul 30, 2003
13,606
4,496
Delaware
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.
http://support.apple.com/en-us/HT202801

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.
 
Last edited:

bdsmith63

macrumors regular
Original poster
Dec 19, 2009
100
17
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.
http://support.apple.com/en-us/HT202801

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.

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
 

65535

macrumors member
Jul 20, 2011
63
0
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

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.
 

bdsmith63

macrumors regular
Original poster
Dec 19, 2009
100
17
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.

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.
 

ZMacintosh

macrumors 65816
Nov 13, 2008
1,445
684
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?

http://support.apple.com/kb/DL1775

That happened to a recent Thunderbolt Display, and after running the firmware it has not since persisted in flashing.
 

bdsmith63

macrumors regular
Original poster
Dec 19, 2009
100
17
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?

http://support.apple.com/kb/DL1775

That happened to a recent Thunderbolt Display, and after running the firmware it has not since persisted in flashing.

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?
 

drambuie

macrumors 6502a
Feb 16, 2010
751
1
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.
 
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