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07-28-2015, 02:45 PM #1

- Member Since
- Sep 03, 2009
- Posts
- 8
Thunderbolt monitor goes blank for a fraction of a secondI have a Mac Pro (late 2013) and an Apple Thunderbolt 27-inch monitor, running 10.10.4, and as far as I can tell, the firmware is all up to date. Starting a few months ago my monitor will suddenly go black for a fraction of a second at random moments. It happens several times per hour, typically. Suggestions? Thanks.
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07-28-2015, 03:24 PM #2

- Member Since
- Jan 23, 2008
- Location
- Fort Worth, Texas
- Posts
- 49,270
- Specs:
- Late 2013 27" iMac, iPad 3, iPhone 6s+, iPhone 6+, 3 iPods, El Capitan
Have you tried a new cable from the Mac Pro to the Thunderbolt monitor? Also, is your Thunderbolt monitor still under warranty or extended Apple care?
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07-28-2015, 03:47 PM #3

- Member Since
- Sep 03, 2009
- Posts
- 8
The Apple monitor's Thunderbolt cable is built in; i.e., there's no way to swap a cable.
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07-28-2015, 04:19 PM #4
Is the connection good with the computer? It's very possible that the issue here is simply a loose cable.
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07-29-2015, 12:13 PM #5

- Member Since
- Sep 03, 2009
- Posts
- 8
Indeed, switching the cabe to one of the other Thunderbolt ports fixed the problem! I haven't convinced myself yet if one of the ports is bad or if the connection was just flaky, but the intermittent screen blanking is gone. THANK YOU.
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