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All replies
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Helpful answers
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Jan 11, 2015 9:03 AM in response to jrousselby Jason L,Hey jroussel,
Welcome to Apple Support Communities.
It sounds like there is a flickering issue with the external display when it's connected to your Mac Pro. The article linked below provides a lot of great information and troubleshooting tips that will resolve most issues like this one.
Apple computers: Troubleshooting issues with video on internal or external displays - Apple Support
So long,
-Jason
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Jan 11, 2015 9:15 AM in response to Jason Lby jroussel,Thanks Jason, I tried everything on this page but it does't change anything...
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Sep 25, 2015 11:50 AM in response to jrousselby DenBrass,Hi, jroussel, i have a same problem, my swit 1221 flash 1 sec and disappears for 5 sec, i search in web for solution but nothing.
Do you have find something ?
Thanks
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Sep 25, 2015 12:52 PM in response to jrousselby Grant Bennet-Alder,That problem could be caused by the display struggling to sync with the signal provided by the computer. There are tons of custom settings in the display, and the manufacturer may have some guidance about what should be adjusted for best picture stability.
I found a manual here, but no specific recommendations in it:
http://ep.yimg.com/ty/cdn/yhst-49736532031788/S-1221F-User-Manual.pdf
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