24" cinema display flashes when plugged to an imac

Hello,
I have a 24" cinema display and a 20" apple display connected to an iMac 2011 27" with an ATI Radeon HD 6970M 1 GB. The 24" Cinema display starts to flash quickly after the boot of the computer. Apple technician told us however that this configuration should work without problems.
I plug the 24 "cinema display on my Mac Pro rev 1.1 with an ATI Radeon HD 4870/512 MB. ​​I have no problem of display even after a long time of use.
I plug the same screen on a MacBook Air late 2010 with a NVIDIA GeForce 320M 256MB using it as the main screen, the laptop cover down. I also have no problem. I have not tested this configuration with the 24" as a second screen.
The iMac motherboard has been changed once. Whenever I talk about this problem to Apple, I have no answer. Does anyone has experienced this kind of situation or know enough about this kind of problem tell me from where it may come?
Thank you

Hi there tomchr9
According to the technical specifications for the 24-inch LED display, the display is compatible with MacBook, MacBook Air, and MacBook Pro systems with Mini DisplayPort. Use of these displays with non-Mac hardware is not supported by Apple.
LED Cinema Display - Technical Specifications
http://support.apple.com/kb/sp502
Hope that helps,
-Griff W

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